Thomas H. Hernon (November 4, 1866 – February 4, 1902) was a professional baseball player. He played part of one season in Major League Baseball for the Chicago Colts (now known as the Cubs) in 1897. He was a right-handed batter and a right-handed thrower. He was 5'7½ feet tall and weighed 156 pounds. Hernon was born in East Bridgewater, Massachusetts, and died in New Bedford, Massachusetts. He is buried in in New Bedford.