The Anti-Terrorism Act is the short title of several pieces of anti-terrorism legislation and may refer to:

• The Anti-Terrorism Act 2005 (Australia)
• The Anti-terrorism Act, 2009 (Bangladesh)
• In Canada:
  • The Anti-Terrorism Act, 2001
  • The Anti-terrorism Act, 2015
• The Anti-Terrorism Act 1997 (Pakistan)
• The Anti-Terrorism Act of 2020 (Philippines)
• In the United States
  • The Antiterrorism and Effective Death Penalty Act of 1996 (federal)
  • The Anti-Terrorism Act of 2001 (New York state)