diff --git a/README.md b/README.md
index 6db9c76..4538817 100644
--- a/README.md
+++ b/README.md
@@ -195,6 +195,8 @@ assert_eq!(kind.extension(), "foo");
 - **bc** - `application/llvm`
 - **mach** - `application/x-mach-binary`
 - **class** - `application/java`
+- **dex** - `application/vnd.android.dex`
+- **dey** - `application/vnd.android.dey`
 
 ## Known Issues
 
diff --git a/src/map.rs b/src/map.rs
index 908bca3..5aa4f73 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -68,6 +68,18 @@ matcher_map!(
         "mach",
         matchers::app::is_mach
     ),
+    (
+        MatcherType::APP,
+        "application/vnd.android.dex",
+        "dex",
+        matchers::app::is_dex
+    ),
+    (
+        MatcherType::APP,
+        "application/vnd.android.dey",
+        "dey",
+        matchers::app::is_dey
+    ),
     // Image
     (
         MatcherType::IMAGE,
diff --git a/src/matchers/app.rs b/src/matchers/app.rs
index f59115a..ce33be9 100644
--- a/src/matchers/app.rs
+++ b/src/matchers/app.rs
@@ -69,3 +69,23 @@ pub fn is_mach(buf: &[u8]) -> bool {
         _ => false,
     }
 }
+
+/// Returns whether a buffer is a Dalvik Executable (DEX).
+pub fn is_dex(buf: &[u8]) -> bool {
+    // https://source.android.com/devices/tech/dalvik/dex-format#dex-file-magic
+
+    buf.len() > 36
+    // magic
+    && buf[0] == 0x64 && buf[1] == 0x65 && buf[2] == 0x78 && buf[3] == 0x0A
+    // file sise
+    && buf[36] == 0x70
+}
+
+/// Returns whether a buffer is a Dey Optimized Dalvik Executable (ODEX).
+pub fn is_dey(buf: &[u8]) -> bool {
+    buf.len() > 100
+    // magic
+    && buf[0] == 0x64 && buf[1] == 0x65 && buf[2] == 0x79 && buf[3] == 0x0A
+    // file sise
+    && is_dex(&buf[40..100])
+}
diff --git a/testdata/sample.dex b/testdata/sample.dex
new file mode 100644
index 0000000..0ac7a7c
Binary files /dev/null and b/testdata/sample.dex differ
diff --git a/testdata/sample.dey b/testdata/sample.dey
new file mode 100644
index 0000000..2263e37
Binary files /dev/null and b/testdata/sample.dey differ
diff --git a/tests/app.rs b/tests/app.rs
index 7ff477e..db00fd8 100644
--- a/tests/app.rs
+++ b/tests/app.rs
@@ -43,3 +43,7 @@ test_format!(
 );
 
 test_format!(APP, "application/wasm", "wasm", wasm, "sample.wasm");
+
+test_format!(APP, "application/vnd.android.dex", "dex", dex, "sample.dex");
+
+test_format!(APP, "application/vnd.android.dey", "dey", dey, "sample.dey");