S
Sean O'Callaghan
- Born
- 26 January 1954 (63 years old)
- Died
- 23 August 2017
- Place of birth
- Tralee, County Kerry, Ireland
- Gender
- Male
Sean O'Callaghan was a member of the Provisional Irish Republican Army, who from the late 1970s to the mid-1980s worked against the organisation from within as a mole for the Irish Government with the Garda Síochána's Special Branch.