Nummi-Pusula (Finnish pronunciation: [ˈnumːiˌpusulɑ]) is a former municipality of Finland. Its seat was in Nummi. Nummi-Pusula was formed in 1981 from the former municipalities Nummi and Pusula. With Karjalohja, it was merged with the town of Lohja on 1 January 2013.

It was located in the province of Southern Finland and was part of the Uusimaa region. The municipality has a population of 6,175 (31 December 2012) and covers an area of 505.13 square kilometres (195.03 sq mi) of which 36.8 km² (14.2 sq mi) is water. The population density is 13.1851/km² (34.1494/sq mi).

The municipality was unilingually Finnish.