MC2 may refer to:
- Maison de la Culture de Grenoble, a venue for performances in Grenoble, France
- Marvel Comics 2 is an imprint from Marvel Comics whose comic books depict an alternative future timeline for the Marvel Universe
- E = mc² is the equation for mass-energy equivalence
- Microids, a French software company formerly known as MC2-Microïds and later just MC2
- MC2, an alternate symbol for ACTH receptor
- Midnight Club 2 a street racing game released in 2003.
- Project Mc2
