Orimattila is a town in Päijänne Tavastia, Finland. As of 2010, about 16,350 people lived there. Nearby municipalities include Hollola, Iitti, Kärkölä, Lahti, Lapinjärvi, Myrskylä, Mäntsälä, Nastola and Pukkila.
The former municipality of Artjärvi was merged with Orimattila in 2011.