Stranmillis is an area in south Belfast, Northern Ireland. It is also an electoral ward for Belfast City Council, part of the Laganbank district electoral area. As part of the Queen's Quarter, it is the location for prominent attractions such as the Ulster Museum and Botanic Gardens. The area is located on Stranmillis Road, with Malone Road to the west and the River Lagan to the east. Its name, meaning "the sweet stream" in Irish, refers to the Lagan, whose waters are still fresh at this point, before becoming brackish as the river flows onward toward its mouth in Belfast Lough.

Laganbank was one of the nine district electoral areas in Belfast, Northern Ireland which existed from 1985 to 2014. Located in the south of the city, the district elected five members to Belfast City Council and contained the wards of Ballynafeigh, Botanic, Shaftesbury, Stranmillis, and Rosetta. Laganbank, along with neighbouring Balmoral, formed the greater part of the Belfast South constituencies for the Northern Ireland Assembly and UK Parliament.