The Lagan Valley is a valley in Northern Ireland between Belfast and Lisburn.
Lagan Valley may also refer to:
Lagan Valley (Assembly constituency), a current constituency in the Northern Ireland Assembly (since 1996) Lagan Valley (UK Parliament constituency), a current constituency in the Westminster parliament (since 1983) Lagan Valley (Northern Ireland Parliament constituency), a constituency in the former Parliament of Northern Ireland (1969–1973) Lagan Valley Hospital, in Lisburn, Northern Ireland