Street Fighter III 2nd Impact: Giant Attack (ストリートファイターⅢ セカンドインパクト GIANT ATTACK^?) is a competitive fighting game produced by Capcom that was released as a coin-operated arcade game in 1997. It is an update of Street Fighter III: New Generation. Like its predecessor, it runs on the CP System III hardware. 2nd Impact introduced new play mechanics, new characters, and new special moves. The game also brings back bonus rounds, not seen in the series since Super Street Fighter II. It is also the only CPS3 title to have a widescreen feature.

2nd Impact was released in a two-in-one compilation for the Dreamcast titled Street Fighter III: Double Impact, which also included the original Street Fighter III. It remains the only official home version of the first two games. 2nd Impact was followed in the arcades by Street Fighter III 3rd Strike: Fight for the Future.