Gwda

The Gwda (; ) is a river in Poland, a tributary of the Noteć. It has a length of and a basin area of . It begins at Lake Studnica, northeast of Szczecinek. Its upper course flows through many lakes. It runs through the town of Piła.
Special fishing rules and regulations regarding trout are in effect for the following sections of the Gwda:
The water of the Gwda was one of the purest in Poland in 1975. However, the water flows have since been degraded due to cities pumping non-processed sewage and industrial plants flushing chemicals and oil.