Kill Switch (stylized as kill.switch) is a third-person shooter video game developed by Namco USA in 2003 for the PlayStation 2, Xbox and Microsoft Windows. A Game Boy Advance port was released in 2004. The GBA port was created independently of Namco, due to a licensing deal with Destination Software. The PAL release of the PS2 port came with a demo of SOCOM II U.S. Navy SEALs on a separate disc.

The most distinguishing characteristic of Kill Switch is its cover system, a mechanic that has the player character taking cover behind objects and around corners in a manner similar to Namco's own Time Crisis series of light gun shooters as well as Koei's third-person shooter WinBack and Hideo Kojima's stealth game Metal Gear Solid 2: Sons of Liberty. However, Kill Switch was the first third-person shooter to feature the cover system as its core game mechanic, though Gears of War would popularize it.