Linus may refer to:

• Linus (mythology) may refer to any of three sons of Apollo from Greek mythology.
• A Roman cognomen.
• Pope Linus, the second Pope of the Catholic Church.
• A figure mentioned at Paul of Tarsus's Second Epistle to Timothy: 'Do thy diligence to come before winter. Eubulus greeteth thee, and Pudens, and Linus, and Claudia, and all the brethren.' (2Tim.4:21, KJV) This may or may not be the same person as Pope Linus.
• Linus van Pelt, a character in the comic strip Peanuts.
• Several well-known individuals who have Linus as a first name:
  • Linus Pauling, chemist.
  • Linus Roache, actor.
  • Linus Torvalds, programmer, creator of the Linux kernel.
• An asteroid moon that orbits 22 Kalliope.