Humppila is a municipality of Finland. It is located in the Tavastia Proper region. The municipality has a population of 2,096 (31 October 2024), which make it the smallest municipality in Tavastia Proper in terms of population. It covers an area of 148.61 square kilometres (57.38 sq mi) of which 0.65 km2 (0.25 sq mi) is water. The population density is 14.17 inhabitants per square kilometre (36.7/sq mi).
The municipality owes the essence of its development to the arrival of the Turku–Toijala railway in 1876. Today, Humppila remains a stop for trains using this line and the once closed railway station has been reopened for passengers. From 1898 until 1974, Humppila was the starting point of the narrow gauge Jokioinen Railway, a 22-kilometre (14 mi) line to the town of Forssa. Today the remaining 15 kilometres (9 mi) of this line make the Jokioinen Museum Railway. There are two significant traffic highways through Humppila municipality: Highway 2 (between Vihti and Pori) and Highway 9 (between Turku and Tampere).
Neighbouring municipalities are Forssa, Jokioinen, Ypäjä, Loimaa, Punkalaidun, and Urjala. The municipality of Humppila is unilingually Finnish.
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