Walter Edward Foster PC (April 9, 1873 – November 14, 1947) was a Canadian politician and businessman in New Brunswick.

Active in community business affairs, Foster served as President of the Saint John Board of Trade in 1908–1909.

In 1916, Walter Foster became leader of the province's Liberal Party which swept to victory in the 1917 election.

His government established the first department of health in 1918, gave women the right to vote in 1919 and created the province's power commission in 1920.

His son, Walter William Vassie Foster, served in the provincial Legislative Assembly.