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Call of Duty App is a first-person and third-person shooter video game franchise. The series began on the PC, and later expanded to consoles and handhelds.

Call of Duty App are published and owned by Activision. While the studio Infinity Ward primarily still develops them, Treyarch has also developed several of the titles with the release of the studios' games interlaced with each other. Some games have been developed by Gray Matter Interactive, Nokia, Exakt Entertainment, Spark Unlimited, Amaze Entertainment, n-Space, Aspyr, Rebellion Developments, Ideaworks Game Studio, Sledgehammer Games, and nStigate Games. The games use a variety of engines, including the id Tech 3, the Treyarch NGL, and the IW 5.0.

As of November 11, 2011, the Call of Duty series has sold over 100 million copies. As of March 31, 2012 there are 40 million monthly active players across all of the Call of Duty titles, with 10 million users of the online service Call of Duty: Elite and 2 million paying annual members. Over 1.6 billion hours of online gameplay have been logged on Modern Warfare 3 since its 2011 release.