Tervakoski is village in Janakkala, Finland. In 2004, there was 4750 inhibitants.
A well-known and popular amusement park Puuhamaa is located in the village.
Tervakoski paper mill, established in 1818's, locates in Tervakoski.
Coordinates: 60°48′50″N 24°37′34″E / 60.814°N 24.626°E