Séamus Hegarty, D.D. (26 January 1940 – 20 September 2019) was an Irish Roman Catholic prelate. He was Bishop of Raphoe from 1982 to 1994, then as Bishop of Derry from 1994 to 2011. Hegarty was born in Kilcar, County Donegal, Ireland.
In November 2011, Hegarty was diagnosed with a "neurodegenerative disease" which forced him to resign from his job. The Holy See announced on 23 November 2011 that his resignation had been accepted.
Hegarty died on 20 September 2019 in Letterkenny, County Donegal, Ireland at the age of 79.