Walther is a name that refers to a German firearms manufacturer, and the term may refer to one of four weapons in the Call of Duty series:
- Walther P38 - A semi-automatic pistol featured in Call of Duty 2: Big Red One, Call of Duty 3 and Call of Duty: World at War.
- Walther G41 - A semi-automatic rifle unique to Call of Duty: World at War (Nintendo DS).
- WA2000 - A semi-automatic sniper rifle featured in Call of Duty: Modern Warfare 2, Call of Duty: Black Ops and Call of Duty Online (and referred to as "Walther 2000" in the latter).
- Toggle Action - A semi-automatic shotgun featured in Call of Duty: WWII, referred to as "Walther" in the game files.