Thomas McDonnell (disambiguation)
Thomas McDonnell (c. 1831–1899) was a military leader in colonial New Zealand.
Thomas McDonnell or McDonell may also refer to:
- Thomas McDonnell Sr. (1788–1864), trader and diplomat in colonial New Zealand
 - Thomas John McDonnell (1894–1961), Roman Catholic bishop in the United States
 - Thomas McDonnell (bishop) (1912–1987), Roman Catholic bishop in Ireland
 - Thomas McDonell (born 1986), actor, musician and artist in the United States
 
See also
- Thomas Macdonnell, pseudonym used by James Fitz Edmond Cotter (c.1630–1705), Irish soldier and colonial governor