Walter George Mitchell, KC (May 30, 1877 – April 3, 1935) was a Canadian lawyer and politician.

Born in Danby, Quebec, the son of William Mitchell, a Canadian senator, and Dora Godard, Mitchell was educated at the Montreal High School, Bishop's College, and McGill University where he received a Bachelor of Civil Law degree in 1901 and was a charter member of Kappa Alpha Society.

He soon was part of the firm Laflamme, Mitchell and Callaghan and was created a King's Counsel in 1912.

He was acclaimed to the Legislative Assembly of Quebec for the electoral district of Richmond in a 1914 by-election called after the death of Peter Samuel George Mackenzie.

He was Treasurer of the Province of Quebec from 1914 to 1921 in the cabinet of Lomer Gouin and Louis-Alexandre Taschereau.