diff --git a/napalm_opnsense/opnsense.py b/napalm_opnsense/opnsense.py
index aa105d3..113068f 100644
--- a/napalm_opnsense/opnsense.py
+++ b/napalm_opnsense/opnsense.py
@@ -1697,6 +1697,49 @@ class OPNsenseDriver(FirewallDriver):
         community = general.get("community", "public") or "public"
         return SNMPConfigDict(running=True, community=community, port=161, version="2c")
 
+    # ── Wake-on-LAN ──────────────────────────────────────────────────────────────
+
+    def send_wake_on_lan(self, mac_address: str, interface: str = "") -> dict[str, Any]:
+        """Send a Wake-on-LAN magic packet via OPNsense's os-wol plugin.
+
+        Calls ``POST /api/wol/wol/set`` with an ephemeral (non-persisted) entry —
+        omitting ``uuid`` from the payload makes OPNsense's ``WolController::setAction``
+        validate and wake immediately without saving a host to config.xml. Requires
+        the os-wol plugin to be installed and the target interface to have a static
+        IPv4 address configured (OPNsense computes the broadcast address from the
+        interface's own IP/subnet; DHCP-assigned interfaces are rejected).
+
+        :param interface: OPNsense's *assigned* interface identifier (e.g. "lan",
+            "opt1") — NOT the physical device name returned by get_interfaces()/
+            get_networks() (e.g. "em0"). Required by this driver.
+        :raises ValueError: if interface is not provided.
+        """
+        if not interface:
+            raise ValueError("OPNsense requires an interface for Wake-on-LAN")
+        try:
+            result = self._post(
+                "/api/wol/wol/set",
+                {"wake": {"interface": interface, "mac": mac_address.strip()}},
+            )
+        except Exception as exc:
+            logger.warning("Wake-on-LAN send failed for %s via %s: %s", mac_address, interface, exc)
+            return {"success": False, "output": str(exc)}
+
+        status = result.get("status")
+        if status == "error":
+            return {
+                "success": False,
+                "output": result.get("error_msg", "OPNsense rejected the Wake-on-LAN request"),
+            }
+        if not result:
+            # Model validation (malformed MAC/interface) fails silently with an
+            # empty {} response at HTTP 200 — no error_msg to surface.
+            return {
+                "success": False,
+                "output": "OPNsense rejected the request (check interface identifier and MAC format)",
+            }
+        return {"success": True, "output": f"Magic packet sent to {mac_address} via {interface}"}
+
     def run_device_action(self, action: str) -> dict[str, Any]:
         """Execute a named action on the firewall."""
         if action == "fix_snmp":
diff --git a/tests/unit/test_driver.py b/tests/unit/test_driver.py
index 9addd9f..64d6d8b 100644
--- a/tests/unit/test_driver.py
+++ b/tests/unit/test_driver.py
@@ -1007,6 +1007,54 @@ class TestInternalPost:
         assert result == {"result": "saved"}
 
 
+# ---------------------------------------------------------------------------
+# send_wake_on_lan()
+# ---------------------------------------------------------------------------
+
+class TestSendWakeOnLan:
+    def test_raises_value_error_without_interface(self, driver):
+        with pytest.raises(ValueError):
+            driver.send_wake_on_lan("AA:BB:CC:DD:EE:FF")
+        driver.session.post.assert_not_called()
+
+    def test_sends_correct_request(self, driver):
+        driver.session.post.return_value = _make_json_response({"status": ""})
+        driver.send_wake_on_lan("AA:BB:CC:DD:EE:FF", interface="lan")
+        driver.session.post.assert_called_once_with(
+            "https://opnsense.example.com/api/wol/wol/set",
+            json={"wake": {"interface": "lan", "mac": "AA:BB:CC:DD:EE:FF"}},
+            timeout=60,
+        )
+
+    def test_success_on_empty_status(self, driver):
+        # OPNsense's WolController returns {"status": trim(configd output)} on
+        # success — the underlying `wol` CLI tool typically prints nothing.
+        driver.session.post.return_value = _make_json_response({"status": ""})
+        result = driver.send_wake_on_lan("AA:BB:CC:DD:EE:FF", interface="lan")
+        assert result == {"success": True, "output": "Magic packet sent to AA:BB:CC:DD:EE:FF via lan"}
+
+    def test_returns_failure_on_error_status(self, driver):
+        driver.session.post.return_value = _make_json_response(
+            {"status": "error", "error_msg": "Incorrect IPv4 configuration on interface"}
+        )
+        result = driver.send_wake_on_lan("AA:BB:CC:DD:EE:FF", interface="opt1")
+        assert result == {"success": False, "output": "Incorrect IPv4 configuration on interface"}
+
+    def test_returns_failure_on_empty_response(self, driver):
+        # OPNsense's model validation (bad MAC/interface) silently returns {}
+        # with HTTP 200 rather than an error status.
+        driver.session.post.return_value = _make_json_response({})
+        result = driver.send_wake_on_lan("AA:BB:CC:DD:EE:FF", interface="lan")
+        assert result["success"] is False
+
+    def test_returns_failure_on_request_exception(self, driver):
+        # e.g. HTTP 404 — the os-wol plugin is not installed on this firewall.
+        driver.session.post.side_effect = Exception("404 Client Error: Not Found")
+        result = driver.send_wake_on_lan("AA:BB:CC:DD:EE:FF", interface="lan")
+        assert result["success"] is False
+        assert "404" in result["output"]
+
+
 # ---------------------------------------------------------------------------
 # load_merge_candidate()
 # ---------------------------------------------------------------------------