Johns River is a short tidal river flowing into the south end of Grays Harbor in the U.S. state of Washington.

There are two main sources of Johns River, the South Fork and the longer North Fork Johns River.

[6][2] Including the North Fork the river is about 15 mi (24 km) long.

Both forks flow generally west and northwest.

Johns River enters Grays Harbor at Markham, about 5 mi (8.0 km) west of Aberdeen.