ATAC

ATAC, or Atac, may refer to:

• Atac, a French supermarket chain
• Asbestos Testing and Consultancy Association, a UK trade association
• American Teens Against Crime, a fictional crime fighting organization in The Hardy Boys Undercover Brothers novel series
• Navy Antiterrorist Alert Center, the 1983–2002 United States Navy terrorism watch center
• Advanced Technology and Academic Centre, a building at Lakehead University's Thunder Bay Campus
• ATAC SpA, the company that provides public transport in Rome, Italy
• Automatic targeting attack communicator, a military communication device in the James Bond movie For Your Eyes Only
• Anti-Terrorist Action Command, a fictional police organization in the 1981 movie Nighthawks
• The ATAC (Arimidex, Tamoxifen, Alone or in Combination) trial was an international randomised controlled trial of 9366 women with localized breast cancer.
• Auto Tension Adjustment Concept, an off-road clipless bicycle pedal system developed by Time (bicycles)
• ATAC-seq, Assay for Transposase-Accessible Chromatin with high throughput sequencing.
• Airborne Tactical Advantage Company, a government contractor delivering dissimilar air combat training capabilities.
• Agenzia del trasporto autoferrotranviario del Comune di Roma, the agency responsible for public transport in Rome, Italy