diff --git a/net/api/src/main/java/org/onlab/onos/net/topology/TopologyEvent.java b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyEvent.java
new file mode 100644
index 0000000..fcbe858
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyEvent.java
@@ -0,0 +1,43 @@
+package org.onlab.onos.net.topology;
+
+import org.onlab.onos.event.AbstractEvent;
+import org.onlab.onos.net.Topology;
+
+/**
+ * Describes network topology event.
+ */
+public class TopologyEvent extends AbstractEvent<TopologyEvent.Type, Topology> {
+
+    /**
+     * Type of topology events.
+     */
+    public enum Type {
+        /**
+         * Signifies that topology has changed.
+         */
+        TOPOLOGY_CHANGED
+    }
+
+    /**
+     * Creates an event of a given type and for the specified topology and the
+     * current time.
+     *
+     * @param type     topology event type
+     * @param topology event topology subject
+     */
+    public TopologyEvent(Type type, Topology topology) {
+        super(type, topology);
+    }
+
+    /**
+     * Creates an event of a given type and for the specified topology and time.
+     *
+     * @param type     link event type
+     * @param topology event topology subject
+     * @param time     occurrence time
+     */
+    public TopologyEvent(Type type, Topology topology, long time) {
+        super(type, topology, time);
+    }
+
+}