diff --git a/src/third_party/glam/glam_similarity.rs b/src/third_party/glam/glam_similarity.rs
new file mode 100644
index 00000000..92107074
--- /dev/null
+++ b/src/third_party/glam/glam_similarity.rs
@@ -0,0 +1,54 @@
+use crate::{Similarity2, Similarity3};
+use glam::{DMat3, DMat4, Mat3, Mat4};
+
+impl From<Similarity2<f32>> for Mat3 {
+    fn from(iso: Similarity2<f32>) -> Mat3 {
+        iso.to_homogeneous().into()
+    }
+}
+impl From<Similarity3<f32>> for Mat4 {
+    fn from(iso: Similarity3<f32>) -> Mat4 {
+        iso.to_homogeneous().into()
+    }
+}
+
+impl From<Similarity2<f64>> for DMat3 {
+    fn from(iso: Similarity2<f64>) -> DMat3 {
+        iso.to_homogeneous().into()
+    }
+}
+impl From<Similarity3<f64>> for DMat4 {
+    fn from(iso: Similarity3<f64>) -> DMat4 {
+        iso.to_homogeneous().into()
+    }
+}
+
+#[cfg(feature = "convert-glam-unchecked")]
+mod unchecked {
+    use crate::{Matrix3, Matrix4, Similarity2, Similarity3};
+    use glam::{DMat3, DMat4, Mat3, Mat4};
+
+    impl From<Mat3> for Similarity2<f32> {
+        fn from(mat3: Mat3) -> Similarity2<f32> {
+            crate::convert_unchecked(Matrix3::from(mat3))
+        }
+    }
+
+    impl From<Mat4> for Similarity3<f32> {
+        fn from(mat4: Mat4) -> Similarity3<f32> {
+            crate::convert_unchecked(Matrix4::from(mat4))
+        }
+    }
+
+    impl From<DMat3> for Similarity2<f64> {
+        fn from(mat3: DMat3) -> Similarity2<f64> {
+            crate::convert_unchecked(Matrix3::from(mat3))
+        }
+    }
+
+    impl From<DMat4> for Similarity3<f64> {
+        fn from(mat4: DMat4) -> Similarity3<f64> {
+            crate::convert_unchecked(Matrix4::from(mat4))
+        }
+    }
+}
diff --git a/src/third_party/glam/mod.rs b/src/third_party/glam/mod.rs
index 55dc82c1..d4f8b643 100644
--- a/src/third_party/glam/mod.rs
+++ b/src/third_party/glam/mod.rs
@@ -3,4 +3,5 @@ mod glam_matrix;
 mod glam_point;
 mod glam_quaternion;
 mod glam_rotation;
+mod glam_similarity;
 mod glam_unit_complex;