ATAC may refer to:

• ATAC - Lakehead University's Advanced Technology and Academic Centre which opened in 2004.
• ATAC, the transit system in Rome, Italy. See Transportation.
• American Teens Against Crime, a fictional crime fighting organization in The Hardy Boys Undercover Brothers novel series.
• ATAC Trial - Arimidex, Tamoxifen, Alone or in Combination - a phase III clinical trial of adjuvant hormonal therapy in post-menopausal women with early breast cancer.
• ATAC - Automatic Torque Amplification Chamber - a Honda method for improving bottom end torque on 2 stroke Motorcycle engines.
• A military communication device in the James Bond movie For Your Eyes Only named Automatic Targeting Attack Communicator
• A satellite weapon system and its operation unit in Steven Seagal's movie Under Siege 2: Dark Territory
• ATAC (Automated Tactical Analysis of Crime) - A computer software application that performs the functions of Tactical Crime Analysis.
• ATAC (Advanced Tactical Air Command) - A computer game by Microprose.
• ATAC -Anti-Terrorism Action Command - A fictional police organization in the movie Night Hawks.

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