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Pikku-Vesijärvi is a pond in Lahti, Päijänne Tavastia, Finland. Its greatest depth is 4.5 meters (1998). Around the pond is an arboretum where is even more than 40 tree species. Also, near Pikku-Vesijärvi is Lanu-puisto, a park where is 12 Olavi Lanu's statues made of concrete. The pond has connection to Vesijärvi. Pikku-Vesijärvi is a popular social spot and is located near to Lahti's center.