Viasat may refer to:

• Viasat (American company) (founded 1986)
• Viasat hack, a cyberattack on the Viasat KA-SAT network that happened in February 2022
• Viasat (Nordic television service) (founded 1991)
• Viasat Cup, 2006 Danish football tournament
• Viasat Ukraine, a Ukrainian direct broadcast satellite television distributor
• Viasat World, operator of:
  • Viasat Nature
  • Viasat Explore
  • Viasat History
• Viasat 1, a Ghanaian television channel
• Viasat 3, a Hungarian TV channel
• Viasat 6, a thematic television channel of Sony Pictures Television Networks