diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index f1062a8cd052a5..0a9f897463b2f8 100644
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -1480,6 +1480,10 @@ def with_hostmask(self):
     def is_unspecified(self):
         return self._ip == 0 and self.network.is_unspecified
 
+    @property
+    def is_loopback(self):
+        return super().is_loopback and self.network.is_loopback
+
 
 class IPv4Network(_BaseV4, _BaseNetwork):
 
diff --git a/Lib/test/test_ipaddress.py b/Lib/test/test_ipaddress.py
index 3f017b97dc28a3..3f84592a31d467 100644
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -2307,6 +2307,10 @@ def testReservedIpv4(self):
         self.assertFalse(ipaddress.ip_interface('0.0.0.0/31').is_unspecified)
         self.assertFalse(ipaddress.ip_interface('1.2.3.4/32').is_unspecified)
 
+        self.assertTrue(ipaddress.ip_interface('127.0.0.1/8').is_loopback)
+        self.assertFalse(ipaddress.ip_interface('127.0.0.1/4').is_loopback)
+        self.assertFalse(ipaddress.ip_interface('1.2.3.4/32').is_loopback)
+
         self.assertEqual(True, ipaddress.ip_interface(
                 '192.168.1.1/17').is_private)
         self.assertEqual(False, ipaddress.ip_network('192.169.0.0').is_private)
diff --git a/Misc/NEWS.d/next/Library/2026-06-20-21-40-02.gh-issue-151785.YkmPlX.rst b/Misc/NEWS.d/next/Library/2026-06-20-21-40-02.gh-issue-151785.YkmPlX.rst
new file mode 100644
index 00000000000000..b04754bb99ef36
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-20-21-40-02.gh-issue-151785.YkmPlX.rst
@@ -0,0 +1,2 @@
+Fix :attr:`!ipaddress.IPv4Interface.is_loopback` to also consider the
+interface's network, matching :class:`ipaddress.IPv6Interface`.