Senator McDonnell may refer to:
Alexander Ronald McDonnell (1901–1989), Montana State Senate Charles McDonnell (Montana politician) (1850–1928), Montana State Senate Frank McDonnell (Irish politician) (fl. 1980s), Senate of Ireland Howard McDonnell (1909–1992), Mississippi State Senate Mike McDonnell (born 1966), Nebraska State Senate
See also Forrest C. Donnell (1884–1980), U.S. Senator from Missouri, 1945 to 1951