Cert or CERT may refer to:

• Carbon Emission Reduction Target, a United Kingdom government initiative
• CERT Group of Companies, a private education provider in the Middle East
• Constant Extension Rate Tensile testing, a standard method of testing of materials, also known as slow strain rate testing
• Certificate (disambiguation), several meanings
• Certiorari, a Latin legal term for a court order requiring judicial review of a case
  • Certiorari before judgment, a specific form of a writ of certiorari
  • Cert pool, shorthand term for the pool of applicants for a writ of certiorari from the United States Supreme Court
• Community Emergency Response Team, teams of volunteer emergency responders across the United States
• Computer Emergency Response Team, an expert group that handles computer security incidents
  • CERT Coordination Center (CERT/CC), the worldwide center for coordinating information about Internet security at Carnegie Mellon University, the first and most well-known CERT
    • CERT C Coding Standard, developed by the CERT/CC at Carnegie Mellon University
  • United States Computer Emergency Readiness Team (US-CERT)
• Correctional Emergency Response Team, a team of correction officers
• Council of Energy Resource Tribes, a consortium of tribes to establish tribal control over natural resources
• Council of Education, Recruitment and Training Irish hospitality training authority 1963–2003