Robert Simms (1761 - ?) was an Irish radical.He was the owner of a paper mill in Ballyclare with his brother William Simms, the proprietor of the Northern Star newspaper. He was one of the founders of the Society of United Irishmen in Belfast and the author of "Declaration and Resolutions of the Society of United Irishmen of Belfast."Robert Simms was a friend of the naturalist John Templeton and his son, also Robert Simms, was one of the founders of the Belfast Natural History Society.