Kullaa is a former municipality of Finland. It joined Ulvila on 1 January 2005.
It is located in the province of Western Finland and is part of the Satakunta region. The municipality had a population of 1,601 (2003) and covered an area of 283.19 km² of which 19.46 km² is water. The population density was 5.7 inhabitants per km².
The municipality was unilingually Finnish.