diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1260fcc..38e6463 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ The format is based on [Keep a Changelog].
   instead of deprecated `--auto-correct` ([#316]).
 * `snakefmt` official formatter for
   [Snakemake](https://snakemake.readthedocs.io) ([#307]).
+* [`gleam`](https://github.com/gleam-lang/gleam) official formatter for
+  [`gleam`](https://github.com/gleam-lang/gleam) ([#325])
 * `zig fmt` official formatter for 
   [zig](https://ziglang.org/) ([#327]).
 
@@ -51,6 +53,7 @@ The format is based on [Keep a Changelog].
 [#316]: https://github.com/radian-software/apheleia/pull/316
 [#317]: https://github.com/radian-software/apheleia/issues/317
 [#319]: https://github.com/radian-software/apheleia/pull/319
+[#325]: https://github.com/radian-software/apheleia/pull/325
 [#326]: https://github.com/radian-software/apheleia/pull/326
 [#327]: https://github.com/radian-software/apheleia/pull/327
 
diff --git a/apheleia-formatters.el b/apheleia-formatters.el
index 30597ae..34ee3fc 100644
--- a/apheleia-formatters.el
+++ b/apheleia-formatters.el
@@ -63,6 +63,7 @@
     (fish-indent . ("fish_indent"))
     (fourmolu . ("fourmolu"))
     (gawk . ("gawk" "-f" "-" "--pretty-print=-"))
+    (gleam . ("gleam" "format" "--stdin"))
     (gofmt . ("gofmt"))
     (gofumpt . ("gofumpt"))
     (goimports . ("goimports"))
@@ -321,6 +322,7 @@ rather than using this system."
     (elm-mode . elm-format)
     (emacs-lisp-mode . lisp-indent)
     (fish-mode . fish-indent)
+    (gleam-ts-mode . gleam)
     (go-mode . gofmt)
     (go-ts-mode . gofmt)
     (graphql-mode . prettier-graphql)
diff --git a/test/formatters/installers/gleam.bash b/test/formatters/installers/gleam.bash
new file mode 100644
index 0000000..bef5316
--- /dev/null
+++ b/test/formatters/installers/gleam.bash
@@ -0,0 +1,5 @@
+ver="$(latest_release gleam-lang/gleam)"
+
+wget "https://github.com/gleam-lang/gleam/releases/download/${ver}/gleam-${ver}-x86_64-unknown-linux-musl.tar.gz" -O /tmp/gleam.tar.gz
+tar -xzf /tmp/gleam.tar.gz -C /usr/local/bin
+chmod +x /usr/local/bin/gleam
diff --git a/test/formatters/samplecode/gleam/in.gleam b/test/formatters/samplecode/gleam/in.gleam
new file mode 100644
index 0000000..f0f93e9
--- /dev/null
+++ b/test/formatters/samplecode/gleam/in.gleam
@@ -0,0 +1,20 @@
+fn encode_(
+  dna: List(Nucleotide),
+  acc: BitArray
+) {
+  case dna {
+        [] -> acc
+    [first, ..rest] ->
+      {
+        let nbit = encode_nucleotide(first)
+        encode_(rest,
+          <<acc:bits, nbit:size(2)>>)
+    }
+  }
+}
+
+pub fn encode(dna: List(Nucleotide)  )
+  -> BitArray
+{
+  encode_(dna, <<>>)
+}
diff --git a/test/formatters/samplecode/gleam/out.gleam b/test/formatters/samplecode/gleam/out.gleam
new file mode 100644
index 0000000..0e54b50
--- /dev/null
+++ b/test/formatters/samplecode/gleam/out.gleam
@@ -0,0 +1,13 @@
+fn encode_(dna: List(Nucleotide), acc: BitArray) {
+  case dna {
+    [] -> acc
+    [first, ..rest] -> {
+      let nbit = encode_nucleotide(first)
+      encode_(rest, <<acc:bits, nbit:size(2)>>)
+    }
+  }
+}
+
+pub fn encode(dna: List(Nucleotide)) -> BitArray {
+  encode_(dna, <<>>)
+}