Lammi (Swedish: Lammi, also Lampis) is a former municipality of Finland. It was consolidated with Hämeenlinna on 2009-01-01.It is located in the province of Southern Finland and is part of the Tavastia Proper region. The municipality had a population of 5,507 (2008) and covered an area of 611.24 km² of which 73.69 km² is water.