T
- Terrence McDonnell (contemporary), American screenwriter
- Thomas McDonnell, Snr. (1788–1864), Irish-New Zealand businessman
- Thomas McDonnell (1831–1899), New Zealand military officer and writer
- Timothy A. McDonnell (born 1937), American Roman Catholic priest and bishop
- Tony McDonnell (professor) (contemporary), British Professor of Planetary and Space Sciences
- Tony McDonnell (born 1976), Irish football player
Read more about this topic: Mc Donnell (surname)