diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e8d922c..f979fcb5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,8 +21,10 @@ The format is based on [Keep a Changelog].
 * [`gawk`](https://www.gnu.org/software/gawk/) for
   [awk](https://en.wikipedia.org/wiki/AWK) ([#187]).
 * [`asmfmt`](https://github.com/klauspost/asmfmt) for assembly ([#168]).
+* [`astyle`](https://github.com/steinwurf/astyle) for C ([#169]).
 
 [#168]: https://github.com/radian-software/apheleia/pull/168
+[#169]: https://github.com/radian-software/apheleia/pull/169
 [#174]: https://github.com/radian-software/apheleia/pull/174
 [#182]: https://github.com/radian-software/apheleia/pull/182
 [#187]: https://github.com/radian-software/apheleia/pull/187
diff --git a/apheleia.el b/apheleia.el
index 5684990a..66a40250 100644
--- a/apheleia.el
+++ b/apheleia.el
@@ -32,7 +32,9 @@
   :link '(emacs-commentary-link :tag "Commentary" "apheleia"))
 
 (defcustom apheleia-formatters
-  '((asmfmt . ("asmfmt"))
+  '((astyle . ("astyle" (apheleia-formatters-locate-file
+                         "--options" ".astylerc")))
+    (asmfmt . ("asmfmt"))
     (bean-format . ("bean-format"))
     (black . ("black"
               (when (apheleia-formatters-extension-p "pyi") "--pyi")
diff --git a/test/formatters/installers/astyle.bash b/test/formatters/installers/astyle.bash
new file mode 100644
index 00000000..2a9cde97
--- /dev/null
+++ b/test/formatters/installers/astyle.bash
@@ -0,0 +1 @@
+apt-get install -y astyle
diff --git a/test/formatters/samplecode/astyle/in.c b/test/formatters/samplecode/astyle/in.c
new file mode 120000
index 00000000..4e7891c2
--- /dev/null
+++ b/test/formatters/samplecode/astyle/in.c
@@ -0,0 +1 @@
+../clang-format/in.c
\ No newline at end of file
diff --git a/test/formatters/samplecode/astyle/out.c b/test/formatters/samplecode/astyle/out.c
new file mode 100644
index 00000000..bfc35f67
--- /dev/null
+++ b/test/formatters/samplecode/astyle/out.c
@@ -0,0 +1,5 @@
+// https://www.ioccc.org/2020/burton/prog.c
+int main(int b,char**i) {
+    long long n=B,a=I^n,r=(a/b&a)>>4,y=atoi(*++i),_=(((a^n/b)*(y>>T)|y>>S)&r)|(a^r);
+    printf("%.8s\n",(char*)&_);
+}