The Gilmour-Parker House is located on Prytania Street in the Garden District of New Orleans, Louisiana. The Italianate style mansion was erected in 1853 for Thomas Corse Gilmour, a London-born cotton merchant, by architect-builder Isaac Thayer. The house was sold by the Gilmour heirs in 1882 to John M. Parker, whose son, John M. Parker, Jr., lived here, and later served as governor of Louisiana from 1920 to 1924. The dining room extension with bay window was added by Mrs. Sarah Roberta Buckner, widow of John M. Parker, between 1897 and 1899. The original carriage house is now used as a separate residence.