Michael Duggan began his career writing in 1981 for the TV show Hill Street Blues and then moved on to shows such as St. Elsewhere and Law & Order. He began producing television shows in 1984 with Miami Vice and Midnight Run. Duggan has executive produced the series Earth 2 and part of the third season of Millennium.
- Seán Mór Ó Dubhagáin (died 1372) Gaelic-Irish poet.
- Patrick Duggan (10 November 1813-15 August 1896) Roman Catholic Bishop of Clonfert.
- Tomás Bacach Ó Dúgáin, (fl. 1848-1858), scribe.
- Maolsheachlainn Ó Dúgáin, (fl. mid-19th century), scribe.
- Liam Ó Dúgáin, (fl. mid-19th century), scribe.
- Seánie Duggan (born 1922), retired Irish sportsman.
- Joe Dugan (1897–1982), American baseball player from 1917–1931
- General Michael Dugan (born 1937), former Chief of Staff of the United States Air Force
- Raymond Smith Dugan, (1878–1940), American Astronomer, textbook author and professor at Princeton University
- Jeremiah Duggan (1980–2003), British student who died in disputed circumstances linked to the LaRouche movement.