4C

4C may refer to:

• "4C" (Person of Interest), an episode of the TV series Person of Interest
• 4C Array, a cylindrical paraboloid radio telescope at the Mullard Radio Astronomy Observatory
• 4C Entity, a consortium to establish a platform for digital rights management schemes
• Alfa Romeo 4C, a sports car
• Fourth Cambridge Survey of Extra-Terrestrial Radio Sources
• Cape Cod Community College (4Cs)
• 4/C, a proposed supertall skyscraper in Seattle, Washington
• LATAM Colombia, a Colombian airline IATA code
• STD-4C, a classification of cluster mailboxes defined by the United States Postal Service
• 4C, a grade of afro-textured hair in the Andre Walker Hair Typing System
• 4C, the production code for the 1975 Doctor Who serial The Ark in Space
• The 4 C's or marketing mix, a business tool used in marketing products
• The 4 C's of 21st century skills education: Collaboration, Communication, Critical thinking, Creativity
• FourCC, a four-character code used in software for identifying an object
• Zen 4c