diff --git a/README.md b/README.md
index 69d8f7e..ad05b93 100644
--- a/README.md
+++ b/README.md
@@ -174,6 +174,7 @@ assert_eq!(kind.extension(), "foo");
 - **dcm** - `application/dicom`
 - **zst** - `application/zstd`
 - **msi** - `application/x-ole-storage`
+- **cpio** - `application/x-cpio`
 
 #### Book
 
diff --git a/src/map.rs b/src/map.rs
index 1d92627..05e16a6 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -564,6 +564,12 @@ matcher_map!(
         "msi",
         matchers::archive::is_msi
     ),
+    (
+        MatcherType::Archive,
+        "application/x-cpio",
+        "cpio",
+        matchers::archive::is_cpio
+    ),
     // Text
     (
         MatcherType::Text,
diff --git a/src/matchers/archive.rs b/src/matchers/archive.rs
index 710ab99..3e6c53e 100644
--- a/src/matchers/archive.rs
+++ b/src/matchers/archive.rs
@@ -216,3 +216,17 @@ pub fn is_msi(buf: &[u8]) -> bool {
         && buf[6] == 0x1A
         && buf[7] == 0xE1
 }
+
+/// Returns whether a buffer is a CPIO archive.
+pub fn is_cpio(buf: &[u8]) -> bool {
+    (buf.len() > 1
+        && ((buf[0] == 0xC7 && buf[1] == 0x71) // little endian, old format
+        || (buf[0] == 0x71 && buf[1] == 0xC7))) // big endian, old format
+    || (buf.len() > 6
+        && buf[0] == 0x30
+        && buf[1] == 0x37
+        && buf[2] == 0x30
+        && buf[3] == 0x37
+        && buf[4] == 0x30
+        && buf[5] == 0x31) // newc format
+}
diff --git a/testdata/sample.cpio b/testdata/sample.cpio
new file mode 100644
index 0000000..ea1b8bd
Binary files /dev/null and b/testdata/sample.cpio differ
diff --git a/tests/archive.rs b/tests/archive.rs
index f2f1e1d..37c8e5a 100644
--- a/tests/archive.rs
+++ b/tests/archive.rs
@@ -9,3 +9,5 @@ test_format!(
 );
 
 test_format!(Archive, "application/zstd", "zst", zst, "sample.tar.zst");
+
+test_format!(Archive, "application/x-cpio", "cpio", cpio, "sample.cpio");