Renko is a former municipality of Finland. It was consolidated with Hämeenlinna on 2009-01-01.
It was located in the province of Southern Finland and is part of the Kanta-Häme region. The municipality had a population of 2,378 (30 November 2008) and covered an area of of which is water. The population density is .
The municipality is unilingually Finnish. The municipality has previously also been known as "Rengo" in Swedish documents, but is today referred to as "Renko" also in Swedish.