Thomas John "Tommy" Morgan, Jr. was an English-born American labor leader and socialist political activist. Morgan is best remembered as one of the pioneer English-speaking Socialists in the city of Chicago and a frequent candidate for public office of the Socialist Party of America. Morgan was also one of the founders and leading figures of the United Labor Party, an Illinois political party which elected 7 of its members to the Illinois State Assembly and another to the Illinois State Senate in the election of 1886. He was married to Elizabeth Chambers Morgan.

The Chicago mayoral election of 1891 saw "Reform" candidate Hempstead Washburne narrowly win a four-way race against incumbent Democrat DeWitt Clinton Cregier, former mayor Carter Harrison Sr., and Citizens Party nominee Elmer Washburn. Also running was Socialist Labor candidate Thomas J. Morgan. Due to the four-way split in popular support, Washburne won with merely a 28.83% vote share; less than a quarter-of-a-percent margin of victory over second-place finisher Cregier and only 2.47% ahead of third-place finisher Harrison.