diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index e038672..18927a5 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -2773,6 +2773,14 @@ EVAL "return 123 * 234" 0`,
     compile: "pandoc main.rst -o main.html",
     run: "prettier --no-config main.html",
     template: `Hello, world!
+`,
+  },
+  rexx: {
+    aliases: ["regina", "reginarexx"],
+    name: "REXX",
+    main: "main.rexx",
+    run: "rexx main.rexx",
+    template: `say "Hello, world!"
 `,
   },
   riscv: {
diff --git a/scripts/docker-install-phase3c.bash b/scripts/docker-install-phase3c.bash
index 634b82a..96faa06 100755
--- a/scripts/docker-install-phase3c.bash
+++ b/scripts/docker-install-phase3c.bash
@@ -118,6 +118,9 @@ rc
 # Redis
 redis
 
+# REXX
+regina-rexx
+
 # RISC-V
 gcc-riscv64-linux-gnu
 qemu-user-static