Rockstar San Diego, Inc. (formerly Angel Studios, Inc.) is an American video game developer and a studio of Rockstar Games based in Carlsbad, California. Colombian entrepreneur Diego Angel founded the company as Angel Studios in January 1984 after studying film in Chicago, where he grew fond of computer animation. The studio began with a focus on animation and visual effects for multimedia productions such as advertisements, films, and music videos.

Notable productions include the film The Lawnmower Man and the music video for Peter Gabriel's song "Kiss That Frog". Angel Studios began working in the video game industry during the 1990s, creating cutscenes for Ed Annunziata's Ecco: The Tides of Time (1994) and Mr. Bones (1996). The company developed full games with Nintendo (Major League Baseball Featuring Ken Griffey Jr. and Ken Griffey Jr.'s Slugfest) and Microsoft (Midtown Madness and Midtown Madness 2), and produced a port of Capcom's Resident Evil 2 for the Nintendo 64.

Rockstar Games was impressed with the studio's work on Midtown Madness and offered a long-term partnership in 1999, which resulted in the creation of the video game series Midnight Club and Smuggler's Run. Angel Studios was acquired by Rockstar Games' parent company Take-Two Interactive in November 2002 and became Rockstar San Diego. Angel left the studio in May 2005 and returned to Colombia. Since 2004, Rockstar San Diego has operated an internal game engine team that develops Rockstar Games' proprietary Rockstar Advanced Game Engine, which is used in most of the publisher's titles. The studio led the development of further Midnight Club games, Red Dead Revolver (2004), Red Dead Redemption (2010), and its expansion pack Undead Nightmare. The studio collaborated with other Rockstar Games studios on Max Payne 3 (2012), Grand Theft Auto V (2013), and Red Dead Redemption 2 (2018).