The Computer Security and Industrial Cryptography research group, commonly called COSIC, is a research group at the Department of Electrical Engineering of the Katholieke Universiteit Leuven, which is headed by Professor Bart Preneel, Vincent Rijmen, and Professor Ingrid Verbauwhede.

Cosic is a Bosnian, Croatian and Serbian surname. It may refer to:

• Božidar Cosic (born 1982), Serbian professional footballer
• Dobrica Cosic (1921–2014), Serbian writer
• Ivan Cosic (born 1989), Croatian-German footballer
• Krešimir Cosic (1948–1995), Croatian basketball player
  • Krešimir Cosic Cup, the national basketball cup of Croatia
  • Krešimir Cosic Hall, multi-use indoor arena in Zadar, Croatia
• Krešimir Cosic (born 1949), Croatian soldier and politician
• Uroš Cosic (born 1992), Serbian footballer
• Vuk Cosic (born 1966), Serbian
• Zlatko Cosic, Bosnia and Herzegovina experimental filmmaker and video artist