Senator Cowan may refer to:
Edgar Cowan (1815–1885), U.S. Senator from Pennsylvania from 1861 to 1867 Jim Cowan (born 1942), Canadian Senator for Nova Scotia from 2005 to 2017 Mo Cowan (born 1969), U.S. Senator from Massachusetts in 2013 Thomas F. Cowan (1927–2010), New Jersey State Senate
See also Anna Cowin (fl. 1960s–2000s), Florida State Senate