M5 Industries, more commonly referred to as just M5 or even Mythbusters, is the main building for Jamie Hyneman's special effects crafting and design shop, the other branch next door being M7, is the building used mainly for the Build Team (Kari, Grant, and Tory) to work on their own builds. M5 is located at 1268 Missouri Street, San Francisco, California, U.S.A. (37°45′1.34″N, 122°23′44.56″W), in the Potrero Hill neighborhood.

M5 was named by Adam Savage after what he thought was the British Secret Service, but he was later told the British Secret Service was MI6, not M5.