Outerbridge Horsey (March 5, 1777 - June 9, 1842) was an American politician from the state of Delaware of the United States during the 19th Century.
Horsey was born in Sussex County, Delaware, in 1777. He studied law, was admitted to the bar, and began practice in Wilmington, Delaware.
He was Attorney General of Delaware from 1806 to 1810 and elected United States Senator from Delaware to replace the deceased Samuel White. He was admitted to the bar in 1807 and had served as a member of the Delaware House of Representatives from 1800 to 1802.
Horsey served as Senator from 1810 until 1821. One of his Senate accomplishments was the presentation a petition from the citizens of Delaware to repeal the Embargo Act. Horsey was able to see the appointment of a committee to consider the repeal, but the attempt was unsuccessful. While in Congress he served as Chairman of the District of Columbia.
Horsey would later become the owner of a sugar plantation in Louisiana. He died in Needwood, his wife's Maryland estate, in 1842.