Lake Arthur may refer to:
;Canada
- Lake Arthur (Quebec), a lake in the Côte-Nord administrative region, Quebec.
;New Zealand
- Lake Arthur (West Coast), a lake in the West Coast region, South Island
- Lake Rotoroa (Tasman), formerly known as Lake Arthur
;United States
- Lake Arthur, Louisiana, a town in Jefferson Davis Parish
- Lake Arthur (Minnesota), a lake in Polk County
- Lake Arthur, New Mexico, a town in Chaves County
- Lake Arthur, Pennsylvania, a lake in Butler County
- Lake Arthur (Washington), a lake in Spokane, next to Gonzaga University
- , a ship in the United States Navy named after the Louisiana town
See also
- Arthurs Lake (Tasmania), a lake in Australia