diff --git a/src/wireviz/wv_bom.py b/src/wireviz/wv_bom.py
index cf5c04f..f7d97e9 100644
--- a/src/wireviz/wv_bom.py
+++ b/src/wireviz/wv_bom.py
@@ -9,7 +9,7 @@ import tabulate as tabulate_module
 
 from wireviz.wv_utils import html_line_breaks
 
-BOM_HASH_FIELDS = "description qty_unit amount partnumbers"
+BOM_HASH_FIELDS = "description qty_unit amount partnumbers url"
 
 
 BomEntry = namedtuple("BomEntry", "category qty designators")
@@ -98,7 +98,7 @@ def pn_info_string(
 def bom_list(bom):
     headers = (
         "# Qty Unit Description Amount Unit Designators "
-        "P/N Manufacturer MPN Supplier SPN Category".split(" ")
+        "P/N Manufacturer MPN Supplier SPN URL Category".split(" ")
     )
     rows = []
     rows.append(headers)
@@ -125,6 +125,7 @@ def bom_list(bom):
             )
         else:
             cells.extend([None, None, None, None, None])
+        cells.append(hash.url)
         # cells.extend([f"{entry['category']} ({entry['category'].name})"])  # for debugging
         rows.append(cells)
     # remove empty columns
diff --git a/src/wireviz/wv_dataclasses.py b/src/wireviz/wv_dataclasses.py
index 49242cf..3890e2d 100644
--- a/src/wireviz/wv_dataclasses.py
+++ b/src/wireviz/wv_dataclasses.py
@@ -191,6 +191,8 @@ class Component:
     mpn: str = None
     supplier: str = None
     spn: str = None
+    # URL (makes nodes/edges clickable in SVG, appears in BOM)
+    url: Optional[Union[str, List[str]]] = None
     # BOM info
     qty: Optional[Union[None, int, float]] = None
     amount: Optional[NumberAndUnit] = None
@@ -212,12 +214,15 @@ class Component:
         else:
             _amount = self.amount
 
+        # For BOM hashing, use scalar url only (lists are per-wire, handled by WireClass)
+        _url = self.url if isinstance(self.url, str) else None
         if self.sum_amounts_in_bom:
             _hash = BomHash(
                 description=self.description,
                 qty_unit=_amount.unit if _amount else None,
                 amount=None,
                 partnumbers=self.partnumbers,
+                url=_url,
             )
         else:
             _hash = BomHash(
@@ -225,6 +230,7 @@ class Component:
                 qty_unit=None,
                 amount=_amount,
                 partnumbers=self.partnumbers,
+                url=_url,
             )
         return _hash
 
@@ -630,6 +636,7 @@ class WireClass:
     ignore_in_bom: Optional[bool] = False
     sum_amounts_in_bom: bool = True
     partnumbers: PartNumberInfo = None
+    url: Optional[str] = None
 
     @property
     def bom_hash(self) -> BomHash:
@@ -639,6 +646,7 @@ class WireClass:
                 qty_unit=self.length.unit if self.length else None,
                 amount=None,
                 partnumbers=self.partnumbers,
+                url=self.url,
             )
         else:
             _hash = BomHash(
@@ -646,6 +654,7 @@ class WireClass:
                 qty_unit=None,
                 amount=self.length,
                 partnumbers=self.partnumbers,
+                url=self.url,
             )
         return _hash
 
@@ -786,6 +795,14 @@ class Cable(TopLevelGraphicalComponent):
         else:
             return None  # non-bundles do not support lists of part data
 
+    def _get_wire_url(self, idx) -> Optional[str]:
+        if self.category == "bundle" and isinstance(self.url, list):
+            return self.url[idx] if idx < len(self.url) else None
+        elif self.category == "bundle" and isinstance(self.url, str):
+            return self.url  # scalar URL applies to all wires
+        else:
+            return None
+
     def __post_init__(self) -> None:
         super().__post_init__()
 
@@ -851,6 +868,14 @@ class Cable(TopLevelGraphicalComponent):
                 else:
                     raise Exception("lists of part data are only supported for bundles")
 
+        # validate URL lists
+        if isinstance(self.url, list):
+            if self.category == "bundle":
+                if len(self.url) != self.wirecount:
+                    raise Exception("URL list length must match wirecount")
+            else:
+                raise Exception("URL lists are only supported for bundles")
+
         # all checks have passed
         wire_tuples = zip_longest(
             # TODO: self.wire_ids
@@ -874,6 +899,7 @@ class Cable(TopLevelGraphicalComponent):
                 sum_amounts_in_bom=self.sum_amounts_in_bom,
                 ignore_in_bom=self.ignore_in_bom,
                 partnumbers=self._get_wire_partnumber(wire_index),
+                url=self._get_wire_url(wire_index),
             )
 
         if self.shield:
diff --git a/src/wireviz/wv_harness.py b/src/wireviz/wv_harness.py
index 6c51e89..d148fc1 100644
--- a/src/wireviz/wv_harness.py
+++ b/src/wireviz/wv_harness.py
@@ -309,17 +309,18 @@ class Harness:
                 label=f"<\n{gv_html}\n>",
                 shape="box",
                 style="filled",
+                href=connector.url if isinstance(connector.url, str) else '',
             )
             # generate edges for connector loops
             if len(connector.loops) > 0:
-                dot.attr("edge", color="#000000")
+                dot.attr("edge", color="#000000", href='')
                 loops = gv_connector_loops(connector)
                 for head, tail, color in loops:
                     dot.edge(head, tail, color = color, label = " ", noLabel="noLabel")
 
             # generate edges for connector shorts
             if len(connector.shorts) > 0:
-                dot.attr("edge", color="#000000")
+                dot.attr("edge", color="#000000", href='')
                 shorts = gv_connector_shorts(connector)
                 for head, tail, color in shorts:
                     dot.edge(head, tail,
@@ -352,12 +353,22 @@ class Harness:
                 label=f"<\n{gv_html}\n>",
                 shape="box",
                 style=style,
+                href=cable.url if isinstance(cable.url, str) else '',
             )
 
             # generate wire edges between component nodes and cable nodes
             for connection in cable._connections:
                 color, l1, l2, r1, r2 = gv_edge_wire(self, cable, connection)
-                dot.attr("edge", color=color)
+                # determine per-wire URL for clickable edges
+                wire_url = ''
+                if connection.via is not None:
+                    wire_idx = connection.via.index
+                    if isinstance(cable.url, list):
+                        wire_url = cable.url[wire_idx] if wire_idx < len(cable.url) else ''
+                        wire_url = wire_url or ''
+                    elif isinstance(cable.url, str):
+                        wire_url = cable.url
+                dot.attr("edge", color=color, href=wire_url)
                 if not (l1, l2) == (None, None):
                     dot.edge(l1, l2)
                 if not (r1, r2) == (None, None):
@@ -365,11 +376,11 @@ class Harness:
 
             for color, we,  ww in gv_edge_wire_inside(cable):
                 if not (we,  ww) == (None, None):
-                    dot.edge(we,  ww, color=color, straight="straight")
+                    dot.edge(we,  ww, color=color, straight="straight", href='')
         for mate in self.mates:
             color, dir, code_from, code_to = gv_edge_mate(mate)
 
-            dot.attr("edge", color=color, style="dashed", dir=dir)
+            dot.attr("edge", color=color, style="dashed", dir=dir, href='')
             dot.edge(code_from, code_to)
 
         apply_dot_tweaks(dot, self.tweak)
diff --git a/src/wireviz/wv_output.py b/src/wireviz/wv_output.py
index 07c9b46..1db85d3 100644
--- a/src/wireviz/wv_output.py
+++ b/src/wireviz/wv_output.py
@@ -127,7 +127,10 @@ def generate_html_output(
             row_html = "  <tr>\n"
             for i, item in enumerate(row):
                 td_class = f"bom_col_{bom[0][i].lower()}"
-                row_html = f'{row_html}    <td class="{td_class}">{item if item is not None else ""}</td>\n'
+                cell_value = item if item is not None else ""
+                if bom[0][i] == "URL" and cell_value:
+                    cell_value = f'<a href="{cell_value}">{cell_value}</a>'
+                row_html = f'{row_html}    <td class="{td_class}">{cell_value}</td>\n'
             row_html = f"{row_html}  </tr>\n"
             bom_contents.append(row_html)
 
diff --git a/tests/test_url_href.py b/tests/test_url_href.py
new file mode 100644
index 0000000..dad2f8e
--- /dev/null
+++ b/tests/test_url_href.py
@@ -0,0 +1,314 @@
+# -*- coding: utf-8 -*-
+
+"""Tests for URL/href support (port of upstream PR #168).
+
+Covers:
+- url field on Connector, Cable, AdditionalBomItem, WireClass
+- BOM hash differentiation by URL
+- BOM list URL column presence/absence
+- GraphViz href on nodes and edges
+- HTML output <a> tag wrapping
+"""
+
+import re
+
+import pytest
+
+from wireviz.wv_bom import BomHash, bom_list
+from wireviz.wv_dataclasses import (
+    AdditionalBomItem,
+    Cable,
+    Connector,
+    Metadata,
+    Options,
+    Tweak,
+)
+
+
+def make_connector(**kwargs):
+    args = {"designator": "X1", "pins": [1, 2, 3]}
+    args.update(kwargs)
+    return Connector(**args)
+
+
+def make_cable(**kwargs):
+    args = {"designator": "W1", "wirecount": 3, "colors": ["BK", "RD", "GN"]}
+    args.update(kwargs)
+    return Cable(**args)
+
+
+def make_harness():
+    from wireviz.wv_harness import Harness
+
+    return Harness(
+        metadata=Metadata({}),
+        options=Options(),
+        tweak=Tweak(),
+    )
+
+
+# --- Data model ---
+
+
+class TestUrlDataModel:
+    def test_connector_url_default_none(self):
+        c = make_connector()
+        assert c.url is None
+
+    def test_connector_url_scalar(self):
+        c = make_connector(url="https://example.com/connector")
+        assert c.url == "https://example.com/connector"
+
+    def test_cable_url_default_none(self):
+        c = make_cable()
+        assert c.url is None
+
+    def test_cable_url_scalar(self):
+        c = make_cable(url="https://example.com/cable")
+        assert c.url == "https://example.com/cable"
+
+    def test_bundle_url_list(self):
+        urls = [
+            "https://example.com/wire1",
+            "https://example.com/wire2",
+            "https://example.com/wire3",
+        ]
+        c = make_cable(category="bundle", url=urls)
+        assert c.url == urls
+        # per-wire URLs should be propagated to WireClass objects
+        for i, wire in enumerate(c.wire_objects.values()):
+            if hasattr(wire, "url"):
+                assert wire.url == urls[i]
+
+    def test_bundle_url_scalar_applies_to_all_wires(self):
+        c = make_cable(category="bundle", url="https://example.com/all")
+        for wire in c.wire_objects.values():
+            if hasattr(wire, "url"):
+                assert wire.url == "https://example.com/all"
+
+    def test_bundle_url_list_wrong_length_raises(self):
+        with pytest.raises(Exception, match="URL list length must match wirecount"):
+            make_cable(category="bundle", url=["a", "b"])  # wirecount=3
+
+    def test_non_bundle_url_list_raises(self):
+        with pytest.raises(Exception, match="URL lists are only supported for bundles"):
+            make_cable(url=["a", "b", "c"])  # not a bundle
+
+    def test_additional_bom_item_url(self):
+        item = AdditionalBomItem(
+            type="Heatshrink",
+            url="https://example.com/heatshrink",
+        )
+        assert item.url == "https://example.com/heatshrink"
+
+
+# --- BOM hashing ---
+
+
+class TestUrlBomHash:
+    def test_different_urls_different_hashes(self):
+        c1 = make_connector(url="https://example.com/a")
+        c2 = make_connector(url="https://example.com/b")
+        assert c1.bom_hash != c2.bom_hash
+
+    def test_same_urls_same_hashes(self):
+        c1 = make_connector(url="https://example.com/same")
+        c2 = make_connector(url="https://example.com/same")
+        assert c1.bom_hash == c2.bom_hash
+
+    def test_url_vs_no_url_different_hashes(self):
+        c1 = make_connector(url="https://example.com/a")
+        c2 = make_connector()
+        assert c1.bom_hash != c2.bom_hash
+
+    def test_wire_class_url_in_hash(self):
+        c1 = make_cable(
+            category="bundle",
+            url=["https://a.com", "https://b.com", "https://c.com"],
+        )
+        c2 = make_cable(
+            category="bundle",
+            url=["https://x.com", "https://b.com", "https://c.com"],
+        )
+        # First wire has different URL, so first wire's hash should differ
+        wire1_c1 = list(c1.wire_objects.values())[0]
+        wire1_c2 = list(c2.wire_objects.values())[0]
+        assert wire1_c1.bom_hash != wire1_c2.bom_hash
+        # Second wire has same URL, should match
+        wire2_c1 = list(c1.wire_objects.values())[1]
+        wire2_c2 = list(c2.wire_objects.values())[1]
+        assert wire2_c1.bom_hash == wire2_c2.bom_hash
+
+
+# --- BOM list ---
+
+
+class TestUrlBomList:
+    def _make_bom_with_url(self, url=None):
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1], url=url)
+        harness.add_cable("W1", wirecount=1, colors=["BK"])
+        harness.connect("X1", 1, "W1", 1, None, None)
+        harness.populate_bom()
+        return bom_list(harness.bom)
+
+    def test_url_column_present_when_used(self):
+        rows = self._make_bom_with_url("https://example.com")
+        headers = rows[0]
+        assert "URL" in headers
+        url_idx = headers.index("URL")
+        # at least one row should have the URL value
+        assert any(row[url_idx] == "https://example.com" for row in rows[1:])
+
+    def test_url_column_absent_when_unused(self):
+        rows = self._make_bom_with_url(None)
+        headers = rows[0]
+        assert "URL" not in headers
+
+
+# --- GraphViz href ---
+
+
+class TestUrlGraphviz:
+    def test_connector_node_href(self):
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1], url="https://example.com/x1")
+        harness.add_cable("W1", wirecount=1, colors=["BK"])
+        harness.connect("X1", 1, "W1", 1, None, None)
+        graph = harness.create_graph()
+        gv = graph.source
+        assert 'href="https://example.com/x1"' in gv
+
+    def test_cable_node_href(self):
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1])
+        harness.add_cable("W1", wirecount=1, colors=["BK"], url="https://example.com/w1")
+        harness.connect("X1", 1, "W1", 1, None, None)
+        graph = harness.create_graph()
+        gv = graph.source
+        assert 'href="https://example.com/w1"' in gv
+
+    def test_no_url_produces_empty_href(self):
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1])
+        harness.add_cable("W1", wirecount=1, colors=["BK"])
+        harness.connect("X1", 1, "W1", 1, None, None)
+        graph = harness.create_graph()
+        gv = graph.source
+        # all href attributes should be empty (no real URLs in href values)
+        hrefs = re.findall(r'href="([^"]*)"', gv)
+        assert all(h == '' for h in hrefs), f"Expected all empty hrefs, got: {hrefs}"
+
+    def test_wire_edge_href_scalar(self):
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1])
+        harness.add_cable("W1", wirecount=1, colors=["BK"], url="https://example.com/wire")
+        harness.connect("X1", 1, "W1", 1, None, None)
+        graph = harness.create_graph()
+        gv = graph.source
+        # The wire edge should have the cable URL as href
+        # Look for href in edge attributes
+        edge_hrefs = re.findall(r'href="(https://example\.com/wire)"', gv)
+        assert len(edge_hrefs) >= 1
+
+    def test_loop_edges_clear_href(self):
+        harness = make_harness()
+        harness.add_connector(
+            "X1",
+            pins=[1, 2, 3],
+            url="https://example.com/x1",
+            loops=[[1, 2]],
+        )
+        harness.add_cable("W1", wirecount=1, colors=["BK"])
+        harness.connect("X1", 3, "W1", 1, None, None)
+        graph = harness.create_graph()
+        gv = graph.source
+        # Loop edge attr should clear href
+        # The connector node should have the real href
+        assert 'href="https://example.com/x1"' in gv
+
+    def test_mate_edges_clear_href(self):
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1], url="https://example.com/x1")
+        harness.add_connector("X2", pins=[1], url="https://example.com/x2")
+        harness.add_mate_component("X1", "X2", "->")
+        graph = harness.create_graph()
+        gv = graph.source
+        # Both connectors should have hrefs, mate edge should not leak them
+        assert 'href="https://example.com/x1"' in gv
+        assert 'href="https://example.com/x2"' in gv
+
+
+# --- HTML output ---
+
+
+class TestUrlHtmlOutput:
+    def test_url_wrapped_in_anchor(self):
+        """URL values in BOM should be wrapped in <a> tags in HTML."""
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1], url="https://example.com/part")
+        harness.add_cable("W1", wirecount=1, colors=["BK"])
+        harness.connect("X1", 1, "W1", 1, None, None)
+        harness.populate_bom()
+        bomlist = bom_list(harness.bom)
+
+        # Find URL column index
+        headers = bomlist[0]
+        assert "URL" in headers
+        url_idx = headers.index("URL")
+
+        # The connector row should have the URL
+        url_values = [row[url_idx] for row in bomlist[1:] if row[url_idx]]
+        assert "https://example.com/part" in url_values
+
+    def test_empty_url_not_wrapped(self):
+        """Rows without URLs should not get anchor tags."""
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1], url="https://example.com/part")
+        harness.add_connector("X2", pins=[1])  # no URL
+        harness.add_cable("W1", wirecount=1, colors=["BK"])
+        harness.connect("X1", 1, "W1", 1, "X2", 1)
+        harness.populate_bom()
+        bomlist = bom_list(harness.bom)
+
+        headers = bomlist[0]
+        if "URL" in headers:
+            url_idx = headers.index("URL")
+            # At least one row should have None/empty URL
+            null_urls = [row[url_idx] for row in bomlist[1:] if not row[url_idx]]
+            assert len(null_urls) >= 1
+
+
+# --- Backward compatibility ---
+
+
+class TestBackwardCompatibility:
+    def test_connector_without_url(self):
+        c = make_connector()
+        assert c.bom_hash is not None
+        assert c.url is None
+
+    def test_cable_without_url(self):
+        c = make_cable()
+        assert c.bom_hash is not None
+        assert c.url is None
+
+    def test_bundle_without_url(self):
+        c = make_cable(category="bundle")
+        for wire in c.wire_objects.values():
+            assert wire.bom_hash is not None
+            if hasattr(wire, "url"):
+                assert wire.url is None
+
+    def test_full_harness_without_urls(self):
+        harness = make_harness()
+        harness.add_connector("X1", pins=[1, 2])
+        harness.add_connector("X2", pins=[1, 2])
+        harness.add_cable("W1", wirecount=2, colors=["BK", "RD"])
+        harness.connect("X1", 1, "W1", 1, "X2", 1)
+        harness.connect("X1", 2, "W1", 2, "X2", 2)
+        harness.populate_bom()
+        bomlist = bom_list(harness.bom)
+        headers = bomlist[0]
+        # URL column should be auto-removed when no URLs are used
+        assert "URL" not in headers