Margaret Elizabeth Rosemary Barton (née Gregg) (born 26 July 1957) is an Ulster Unionist Party (UUP) politician and former schoolteacher who has been a Fermanagh and Omagh Councillor for the Erne North DEA since October 2024, having previously represented the area from 2014 to 2016.

[4] Barton joined cross-community calls for an independent inquiry headed by the Lord Chief Justice of Northern Ireland into the Renewable Heat Incentive scandal.

[8] Barton lost her seat to running mate Tom Elliott at the 2022 Assembly election, polling 2,912 first-preference votes (5.45%), and was eliminated on the third count.

[9][10] In November 2022, she was co-opted as a councillor for the Mid Tyrone District, succeeding UUP veteran, Bert Wilson.

[12][13] In October 2024, following the co-option of Erne North councillor Diana Armstrong to the Assembly, Barton replaced her on the council.