The Walther Model 9 was a semi-automatic pistol produced by Carl Walther GmbH and chambered in .25 ACP.

The decision to use a striker vs. that of an internal hammer like on the Walther Model 8 was to reduce overall size of the gun, but sacrificed reliability.

If the striker spring is compressed for extended periods of time it can weaken and not have enough force to ignite the primer causing a misfire.

The Model 9 is similar in size and function to the Baby Browning pistol which is only slightly larger.

During World War II, thousands of the Model 9 pistols were delivered to the Wehrmacht.