May 15 is the 135th day of the year in the Gregorian calendar (136th in leap years). There are 230 days remaining.
- 1905: Joseph Cotten (actor)
- 1909: James Mason (actor)
- 1936: Paul Zindel (novelist, playwright)
- 1943: David Cronenberg (director)
- 1948: Brian Eno (musician, record producer)
- 1951: Jonathan Richman (musician)