Mike Donnelly Sr. (1880–1972) was an American politician who served as Mayor of Oklahoma City in 1923, succeeding Mayor Jack C. Walton who'd been elected governor.

Mike Donnelly was born on October 14, 1880, in Bucklin, Missouri.

He succeeded Jack C. Walton as Mayor of Oklahoma City, serving between January 9, 1923, and April 4, 1923.

[2] He also worked for the Oklahoma Highway Department for 16 years.

[2][3][4] He was entombed at Rose Hill Burial Park in Oklahoma City.