A radius is a straight line or distance from the center to the edge of a curve.
Radius may also refer to:
People
- Alexandra Radius (born 1942), Dutch ballerina
- Justus Radius (1797–1884), German pathologist and ophthalmologist
- Radius Prawiro (1928–2005), Indonesian economist and politician
Arts, entertainment, and media
Fictional entities
- Radius (Chrono Cross), a character in Chrono Cross
- Radius (comics), a superhero in the Marvel Comics universe
- Radius (R.U.R.), a character in Karel Čapek's science fiction play R.U.R.
Film
- Radius (film), a 2017 Canadian film directed by Caroline Labrèche and Steeve Léonard
Music
- Radius (band), a band from Los Angeles, California
- Radius (music ensemble), a London music ensemble founded by Tim Benjamin
Companies
- Radius Inc., a defunct computer hardware company
- Radius Intelligence, a defunct enterprise software company
- Radius Payment Solutions, a payment and fleet services technology and software company
- Radius Travel, a travel management company
Mathematics
- Radius (graph theory), the minimum distance from a graph's node to the node that is farthest from it
- Radius of convergence (in calculus), the radius of the region where a complex power series converges
- Radius of curvature, a measure of how gently a curve bends
- Radius of gyration, the root-mean-square distance from a set of points or masses to a given center
- The radial coordinate in a
- The inradius or circumradius of a shape
Science and technology
- Radius (bone), one of the two bones in a forearm
- Bend radius, the minimum radius to which one can bend a pipe, tube, sheet, cable, or hose without damage
- RADIUS (Remote Authentication Dial In User Service), a network authentication protocol
- Turning radius, the minimum radius at which a vehicle can negotiate a turn
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