diff --git a/functions/src/scripts/convert-tag-to-group.ts b/functions/src/scripts/convert-tag-to-group.ts
new file mode 100644
index 00000000..48f14e27
--- /dev/null
+++ b/functions/src/scripts/convert-tag-to-group.ts
@@ -0,0 +1,66 @@
+// Takes a tag and makes a new group with all the contracts in it.
+
+import * as admin from 'firebase-admin'
+import { initAdmin } from './script-init'
+import { isProd, log } from '../utils'
+import { getSlug } from '../create-group'
+import { Group } from '../../../common/group'
+
+const getTaggedContractIds = async (tag: string) => {
+  const firestore = admin.firestore()
+  const results = await firestore
+    .collection('contracts')
+    .where('lowercaseTags', 'array-contains', tag.toLowerCase())
+    .get()
+  return results.docs.map((d) => d.id)
+}
+
+const createGroup = async (
+  name: string,
+  about: string,
+  contractIds: string[]
+) => {
+  const firestore = admin.firestore()
+  const creatorId = isProd()
+    ? 'IPTOzEqrpkWmEzh6hwvAyY9PqFb2'
+    : '94YYTk1AFWfbWMpfYcvnnwI1veP2'
+
+  const slug = await getSlug(name)
+  const groupRef = firestore.collection('groups').doc()
+  const now = Date.now()
+  const group: Group = {
+    id: groupRef.id,
+    creatorId,
+    slug,
+    name,
+    about,
+    createdTime: now,
+    mostRecentActivityTime: now,
+    contractIds: contractIds,
+    anyoneCanJoin: true,
+    memberIds: [],
+  }
+  return await groupRef.create(group)
+}
+
+const convertTagToGroup = async (tag: string, groupName: string) => {
+  log(`Looking up contract IDs with tag ${tag}...`)
+  const contractIds = await getTaggedContractIds(tag)
+  log(`${contractIds.length} contracts found.`)
+  if (contractIds.length > 0) {
+    log(`Creating group ${groupName}...`)
+    const about = `Contracts that used to be tagged ${tag}.`
+    const result = await createGroup(groupName, about, contractIds)
+    log(`Done. Group: `, result)
+  }
+}
+
+if (require.main === module) {
+  initAdmin()
+  const args = process.argv.slice(2)
+  if (args.length != 2) {
+    console.log('Usage: convert-tag-to-group [tag] [group-name]')
+  } else {
+    convertTagToGroup(args[0], args[1]).catch((e) => console.error(e))
+  }
+}