diff --git a/script/matrix-purge-rooms b/script/matrix-purge-rooms
new file mode 100755
index 0000000..e2b11dd
--- /dev/null
+++ b/script/matrix-purge-rooms
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# matrix-purge-rooms purges Matrix rooms with no users.
+# Expects to connect to Synapse on localhost:8008.
+
+set -euo pipefail
+IFS=$'\n\t'
+
+roomstopurge=$(curl -s --header "Authorization: Bearer $SYNAPSE_ACCESS_TOKEN" 'http://localhost:8008/_synapse/admin/v1/rooms?limit=300' | jq -r '.rooms[] | select(.joined_local_members == 0) | .room_id') 
+for roomid in $roomstopurge; do
+  echo "Purging room: $roomid"
+  curl -X DELETE -H "Authorization: Bearer $SYNAPSE_ACCESS_TOKEN" -H "Content-Type: application/json" -d "{\"purge\": true, \"force_purge\": true}" "http://localhost:8008/_synapse/admin/v1/rooms/$roomid"
+  echo
+done