James Miller Tunnell (August 2, 1879 – November 14, 1957) was an American lawyer and politician from Georgetown, in Sussex County, Delaware.

Tunnell first ran for a seat in the United States Senate in 1924, but was defeated by Republican T. Coleman du Pont.

Tunnell lost his bid for a second term in 1946 to Republican John J. Williams from Millsboro, Delaware.

Director of the Farmers' Bank of Delaware (1905-1957)[2]Tunnell was an early supporter of the Equal Rights Amendment.

His son James M. Tunnell Jr. was the Democratic nominee for the class 2 senate seat in 1966, but lost to incumbent J. Caleb Boggs.