Deborah Erskine (born 1990 or 1991; née Armstrong) is a Democratic Unionist Party (DUP) politician from Northern Ireland. She was elected as a councillor for Erne North in the 2019 Fermanagh and Omagh District Council election, and has been a Member of the Legislative Assembly (MLA) for Fermanagh and South Tyrone since the October 2021 co-option.