SA2 may refer to:
- Sonic Adventure 2, a game often abbreviated as "SA2"
- "SA2," the theme that plays during Sonic Adventure 2's title screen
- "Advertise: SA2," the theme that plays during Sonic Adventure 2's story recaps
- "Advertise: SA2 ver.B," the theme that plays during most of Sonic Adventure 2's menu screens
- "Advertise: SA2 ver.C," the theme that plays during Sonic Adventure 2's stage selection screen