Dermot Nesbitt (born 14 August 1947) is a former Ulster Unionist Party (UUP) politician from Northern Ireland who was a Member of the Legislative Assembly (MLA) for South Down from 1998 to 2007.
Nesbitt was educated at Down High School and later studied economics at Queen's University Belfast and joined the Ulster Unionist Party (UUP).
He was the election agent for Brian Faulkner from 1973–77, most of this period spent as a member of the Unionist Party of Northern Ireland.
He retired in 2007, and party colleague John McCallister retained a UUP seat in the South Down constituency.
In mid-morning on 7 December 1983, while chatting to UUP party and Queen's colleague Edgar Graham at the University Square side of the main campus library, Nesbitt witnessed Graham (aged 29) being shot dead by an IRA gunman.