Lambeth (lămˈbəth) [key], inner borough (1991 pop. 220,100) of Greater London, SE England, on the Thames River. It is largely residential but is important as an area of governmental and commercial offices. The borough is also a major transportation hub with several railroad stations, including Waterloo, London's largest. Lambeth is connected to Westminster borough across the Thames by five bridges. The Old Vic, the National Film Theatre, and the Royal Festival Hall are in Lambeth, as are the Imperial War Museum, Morley College, and eight hospitals, two of which (St. Thomas's and King's College hospitals) have medical schools.