diff --git a/amaranth/lib/io.py b/amaranth/lib/io.py
index 2a179ec..09058d2 100644
--- a/amaranth/lib/io.py
+++ b/amaranth/lib/io.py
@@ -114,6 +114,10 @@ class Pin(wiring.PureInterface):
                     self.dir == other.dir and
                     self.xdr == other.xdr)
 
+        def __repr__(self):
+            xdr = f", xdr={self.xdr}" if self.xdr != 0 else ""
+            return f"Pin.Signature({self.width}, dir={self.dir!r}{xdr})"
+
         def create(self, *, path=None, src_loc_at=0):
             return Pin(self.width, self.dir, xdr=self.xdr, path=path, src_loc_at=1 + src_loc_at)
 
@@ -128,11 +132,11 @@ class Pin(wiring.PureInterface):
     @property
     def width(self):
         return self.signature.width
-    
+
     @property
     def dir(self):
         return self.signature.dir
-    
+
     @property
     def xdr(self):
         return self.signature.xdr
diff --git a/tests/test_lib_io.py b/tests/test_lib_io.py
index ae41c07..1c82b1f 100644
--- a/tests/test_lib_io.py
+++ b/tests/test_lib_io.py
@@ -199,6 +199,16 @@ class PinSignatureDDRTestCase(PinSignatureTestCase):
         })
 
 
+class PinSignatureReprCase(FHDLTestCase):
+    def test_repr(self):
+        sig_0 = Pin.Signature(1, dir="i")
+        self.assertRepr(sig_0, "Pin.Signature(1, dir='i')")
+        sig_0 = Pin.Signature(2, dir="o", xdr=1)
+        self.assertRepr(sig_0, "Pin.Signature(2, dir='o', xdr=1)")
+        sig_0 = Pin.Signature(3, dir="io", xdr=2)
+        self.assertRepr(sig_0, "Pin.Signature(3, dir='io', xdr=2)")
+
+
 class PinTestCase(FHDLTestCase):
     def test_attributes(self):
         pin = Pin(2, dir="io", xdr=2)
@@ -208,4 +218,3 @@ class PinTestCase(FHDLTestCase):
         self.assertEqual(pin.signature.width, 2)
         self.assertEqual(pin.signature.dir,   "io")
         self.assertEqual(pin.signature.xdr,   2)
-