Paddy Ryan (1851–1900) was an Irish-American boxer and world heavyweight champion.
Paddy Ryan may also refer to:
- Paddy Ryan (actor) (1911–1990), British TV and film stuntman; see Undercover Girl (1958 film)
- Paddy Ryan (hurler) (1912–1991), Irish hurler
- Patrick Ryan (hammer thrower) (1881–1964), Irish-American hammer thrower
- Paddy Ryan (rugby union, born 1988), Australian rugby union player
- Paddy Ryan (rugby union, born 1990), Irish-American rugby union prop
- Paddy Ryan (rugby union, born 1998) Irish-American rugby union flanker
- Earl Patrick Freeman (1932–1989), Canadian professional wrestler, best known by the ring name Paddy Ryan
- Patrick Joseph Ryan (1904–1969), Australian Catholic priest, nicknamed "Paddy"