Richard Cann McMullen (January 2, 1868 – February 18, 1944) was an American manufacturer and politician from Wilmington, in New Castle County, Delaware.
He worked as a farm hand to meet expenses while studying at Goldey Commercial College.
McMullen was the first Democratic governor in 36 years and throughout his term was frustrated with his inability to replace his political opponents in state government.
As his term was during the latter part of the Great Depression, public works projects were going on throughout the state, including the opening of the Roosevelt Inlet at Lewes, a new bridge over Indian River Inlet and a couple of new stations for the State Police.
McMullen was again nominated as the Democratic Party candidate for governor in 1940, but suffered a heart attack a month before the election and withdrew from the campaign.