ATAC may refer to:

• Lakehead University's Advanced Technology and Academic Centre (ATAC) which opened in 2004
• ATAC, the transit system in Rome, Italy
• American Teens Against Crime, a fictional crime fighting organization in The Hardy Boys Undercover Brothers novel series
• A military communication device in the James Bond movie For Your Eyes Only named Automatic Targeting Attack Communicator
• A.T.A.C -Anti-Terrorist Action Command - A fictional police organization in the movie Nighthawks (film)
• ATAC (Auto Tension Adjustment Concept) - An off-road clipless bicycle pedal system developed by Time
• Air Transport Association of Canada, a national trade association for commercial aviation and flight training industries as well as aviation industry suppliers

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