QEC may refer to:

• Quantum error correction
• Queen Elizabeth Class aircraft carrier, two aircraft carriers of the United Kingdom's Royal Navy
• Electoral Commission of Queensland
• Queen Elizabeth College
  • Queen Elizabeth College, London, UK
  • Queen Elizabeth College, Palmerston North, New Zealand
  • Queen Elizabeth College, Mauritius
• Queen Elizabeth Centre, Ballarat
• Qulliq Energy Corporation

• Jazz Bear
• Jazz Beat
• Jazz Blues Fusion
• Jazz/Bossa Nova
• Jazz box
• Jazz by Sun Ra
• Jazz By Sun Ra
• Jazz club
• Jazz Cola
• Jazzcollections at the University Library of Southern Denmark
• Jazz collections at the University Library of Southern Denmark
• Jazz (comics)
• Jazz Composer's Orchestra
• Jazz Composers' Orchestra
• Jazz Crusaders
• Jazz Dischords and the Story of "Kansas City Stomp"
• Jazz (documentary)
• Jazzed Honeymoon
• Jazz ensemble
• Jazzercizing
• Jazz Fenton
• Jazzfest Berlin
• JazzFest Berlin
• Jazz Fest Berlin
• Jazz FM (UK)