Rupert Williams Haggen (July 29, 1887 – July 19, 1962) was a Canadian politician, who represented the electoral district of Grand Forks-Greenwood in the Legislative Assembly of British Columbia from 1949 to 1956.

He had previously been an unsuccessful candidate in the electoral district of Cariboo in the 1933 provincial election and in the electoral district of Rossland-Trail in the 1945 provincial election.

Haggen finished his education, qualifying as an engineer and was hired by the Canadian Pacific Railway.

Later, Haggen became a notary public, opening offices in Rossland, Grand Forks and Kelowna.

This article about a Member of the Legislative Assembly of British Columbia is a stub.