Robert de Welles, 8th Lord Willoughby de Eresby was the son of Richard de Welles and Joan Willoughby, Baroness Willoughby de Eresby.
He married Elizabeth Bourchier, daughter of Sir John Bourchier, 1st Lord Berners and Marjorie Berners.
He died on 19 March 1469/70.
Robert de Welles, 8th Lord Willoughby de Eresby gained the title of 8th Lord Willoughby de Eresby.