Thomas Alan Greene, known as Tom Greene (born September 7, 1948), is a veterinarian and rancher from Maringouin in Iberville Parish, Louisiana, who served in the Louisiana State Senate from 1992 to 2000. He narrowly won the general election of 1991 and prevailed comfortably in the nonpartisan blanket primary in 1995 as a Democrat. During his second term, however, he switched affiliation to Republican. Greene did not seek a third term in the Senate in the 1999 primary.