Arthur Trahan, KC (May 26, 1877 – September 22, 1950) was a Canadian lawyer, judge and political figure in Quebec.

[1] He was born in Nicolet, Quebec, the son of Narcisse Trahan and Adéline-Rébecca Rousseau, and was educated at the Séminaire de Nicolet and the Université Laval in Montreal.

He was admitted to the Quebec bar in 1901 and set up practice in Nicolet.

Trahan served as a member of the municipal council for Nicolet from 1911 to 1919.

In 1923, Trahan resigned his seat in the House of Commons after he was named to the Quebec Superior Court.