The Waterhen River (French: Rivière de la Poule d'Eau) is a river of Manitoba, Canada. It is the primary outflow for Lake Winnipegosis and flows into Lake Manitoba.

From Long Island Bay at the southeast end of the Lake Winnipegosis the West Waterhen and Little Waterhen rivers flow north about 16 kilometres (10 mi) into Waterhen Lake then the Waterhen River flows south 22 kilometres (14 mi) into Lake Manitoba.

The eponymous community of Waterhen is located along the river.

• 
  PR 328 Bridge across the Waterhen River
• 
  Waterhen River from Waterhen Park
• 
  Waterhen River looking south from Waterhen Park
• 
  Waterhen River looking north from PR 328 Bridge

• List of rivers of Manitoba
• Waterhen, Manitoba

51°44′02″N 99°32′04″W / 51.73389°N 99.53444°W / 51.73389; -99.53444