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MTAC may stand for:

  • Music Teachers' Association of California
  • Mongolian and Tibetan Affairs Commission of the Republic of China's Executive Yuan
  • Multiple Threat Alert Center of the United States' Naval Criminal Investigative Service
  • Middle Tennessee Anime Convention
  • Microsoft Technical Audience Contributor
  • Mathematical Tables and Other Aids to Computation, a 1943- technical journal renamed to "Mathematics of Computation"