Ramsagar National Park, National park with artificial lake in Dinajpur District, Bangladesh

Ramsagar National Park covers 27.76 hectares at Tajpur, about 8 km from Dinajpur town, and is built around the Ramsagar tank, a reservoir 1,031 m long and 364 m wide with banks about 13.5 m high. There are no big trees: the lake lies within embankments, and the red-yellow clay soil supports wetland vegetation.

Ramsagar tank was dug before the Battle of Plassey, between 1750 and 1755, on the orders of Raja Ramnath, Maharaja of Dinajpur (reigned 1722–1760), and named after him. About 1.5 million labourers worked on it at a cost of roughly 30,000 taka. The forest department took charge of the tank in 1960, it was developed as a modern tourist spot in 1995–96, and it became a national park on 30 April 2001.

The lake is named after Raja Ramnath, the 18th-century Maharaja of Dinajpur who had it dug before the Battle of Plassey. Local accounts say 15 million labourers worked on the tank at a cost of 30,000 taka. Since 10 October 2010 a small library of over 800 books, the Ramsagar Library, has operated here on private initiative.

The park is set up for casual day visits with open paths that are easy to walk in regular shoes and no steep slopes. Visitors coming with children will find shade and open space to explore, though medical facilities nearby are limited.

Ramsagar's embankments hold no large trees, so the wetland birds are easy to watch: white-breasted waterhen, jacanas, river tern, ringed plover, grey heron and purple heron. The lake also holds turtles and snakes, and the park's mammal list includes Bengal fox, golden jackal, fishing cat and jungle cat.