Peter Gray may refer to:

• Peter Gray (Australian judge), Australian federal judge
• Peter W. Gray (1819–1874), American lawyer, judge, and legislator from Texas
• Peter Gray (bioengineer) (born 1946), bioengineer in Australia
• Peter Gray (chemist) (1926–2012), professor of physical chemistry at the University of Leeds
• Peter Gray (historian, born 1965), professor of modern Irish history at Queen's University Belfast
• Peter Gray (military historian), military historian at Birmingham University
• Peter Gray (psychologist), American psychologist and author of the introductory psychology textbook, Psychology
• Peter Gray (sailor) (1935–2022), Irish Olympic sailor
• Peter Gray (writer) (1807–1887), Scottish writer
• Peter S. Gray (born 1957), Olympic equestrian for Bermuda and Canada
• Pete Gray (1915–2002), one-armed Major League baseball player
• Pete Gray (activist) (1980–2011), Australian environmental and anti-war activist
• "Peter Gray" (song), American ballad

• The Story of Peter Grey, an Australian television daytime soap opera