Seamus Twomey
| Seamus Twomey | |
|---|---|
| Photograph of Twomey taken in 1972 during an IRA Press Conference | |
| Native name | Séamus Ó Tuama | 
| Nickname(s) | Thumper | 
| Born | 5 November 1919 Lower Falls, Belfast, Ireland | 
| Died | 12 September 1989 (aged 69) Mater Hospital, Dublin, Ireland | 
| Buried | |
| Allegiance | Irish Republic | 
| Branch | Fianna Éireann  (1936–1937) Irish Republican Army (1937–1969) | 
| Rank | Volunteer (1937–early 1970s) Officer Commanding (early 1970s–1973) | 
| Unit | Belfast Brigade | 
| Battles / wars | The Troubles | 
| Spouse(s) | Rosie McCotter | 
Seamus Twomey (Irish: Séamus Ó Tuama; 5 November 1919 – 12 September 1989) was an Irish republican activist, militant, and twice chief of staff of the Provisional IRA.