Other
- Peter J. Ryan (1841–1908), Union Army soldier and Medal of Honor recipient
- Peter John Ryan (1925–2002), Australian surgeon
- Peter Ryan (columnist) (1923–2015), Australian newspaper columnist and author
- Peter Ryan (journalist) (1960–2025), Australian journalist
- Peter Ryan (police officer) (1944–2025), Commissioner of the New South Wales Police from 1996 until 2002
- Peter Ryan (politician) (born 1950), former leader of the National Party of Australia in Victoria
- Peter Ryan (singer), contestant on the first season of Australian Idol
- Peter Ryan (computer scientist), British computer scientist who devised Prêt à Voter
This disambiguation page lists articles about people with the same name.
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