Seamus Anthony Close OBE (12 August 1947 – 7 May 2019) was a Northern Irish politician, member of the Northern Ireland Assembly for Lagan Valley and a deputy leader of the Alliance Party. In August 1981, he was the Alliance candidate for the second Fermanagh and South Tyrone by-election. The following year under the redistribution and expansion of Northern Ireland's constituencies his local political base became part of the new Lagan Valley constituency which he has contested in the Alliance interest in all elections since 1983 apart from the 1986 by-election called in protest against the Anglo-Irish Agreement when the local Alliance branch declined to contest the seat as they believed the by-election was a political stunt.