John Ritter (disambiguation)

John Ritter (1948–2003) was an American actor.

John Ritter may also refer to:
 * John Ritter (congressman) (1779–1851), American legislator from Pennsylvania
 * John Ritter (racing driver) (1910–1948), American racing driver
 * Johann Wilhelm Ritter (1776–1810), German chemist, physicist and philosopher
 * John D. Ritter, vocalist for American metalcore band Myka Relocate
 * John H. Ritter (born 1951), American novelist, short story writer, teacher, and lecturer
 * John Steele Ritter, American classical keyboardist and teacher