Rutajärvi is a lake in Finland. It is situated in the municipality of Urjala in the region of Pirkanmaa and it is a part of Kokemäenjoki basin. The lake is a part of a chain of lakes and rivers that consists of the lakes Nuutajärvi, Rutajärvi and Kortejärvi in Urjala and Tarpianjoki River in Kalvola (now part of Hämeenlinna), Urjala, Kylmäkoski and Viiala (now part of Akaa).