McArthur Lake and variations may refer to:

• Lake McArthur (British Columbia), a lake in Yoho National Park
• McArthur Lake (Northwest Territories), a lake east of Great Slave Lake
• McArthur Lake (Ontario), a lake south of the city of Timmins
• McArthur Lake (Saskatchewan), a lake east of Pelican Narrows, Saskatchewan
• Lac McArthur (Val-des-Monts), a lake in Quebec

• McArthur Lake (Idaho), a reservoir in Idaho
  • McArthur Lake Wildlife Corridor, a wildlife corridor in Idaho
  • McArthur Lake Wildlife Management Area, a protected area in Idaho
• McArthur Lake (Fort Bragg), a reservoir in North Carolina

• List of lakes named McArthur, includes variations such as "MacArthur's Lake" in Australia
• McArthur (disambiguation)