Gregory S. Harris (born June 5, 1955) is an American politician who served as a Democratic member of the Illinois House of Representatives in the 13th district from 2007 to 2023.

He sponsored the Acts which legalized civil unions and same sex marriage in Illinois and rose to become House Majority Leader in 2019.

He then became chief of staff for Chicago alderman Mary Ann Smith, a position in which he served for 14 years.

[2] Larry McKeon, who had held the seat for five terms, announced his intention to retire from the legislature in July 2006.

[4] In 2010, Harris sponsored The Illinois Religious Freedom Protection & Civil Union Act (SB1716), which was signed into law on January 31, 2011, by Governor Pat Quinn.