Edward Walter Rathbun (December 28, 1865 – September 6, 1940) was a business owner and politician in Ontario, Canada.

He represented Hastings East in the Legislative Assembly of Ontario from 1905 to 1908 as an independent Liberal.

The son of Edward Wilkes Rathbun and Elizabeth How Burt, he was born in Deseronto.

Rathbun took over the operation of the family lumber company following his father's death in 1903.

Rathbun was lieutenant-colonel in the local militia and went overseas as the leader of a brigade in the Canadian Field Artillery in 1915.