John Tierney may refer to:
- John Tierney (Australian politician) (born 1946), Liberal member of the Australian Senate, 1991–2005
- John Tierney (Irish politician) (born 1951)
- John Tierney (journalist) (born 1953), American journalist
- John F. Tierney (born 1951), United States Representative from Massachusetts's 6th congressional district
- John Tierney (footballer), football player for Cork City
- John Tierney (Gaelic footballer) (born 1982), former Cavan Gaelic footballer
- John Tierney (cricketer) (born 1964), English cricketer