Cecil Valentine De Vere (14 February 1846 in London – 9 February 1875 in Torquay) was the winner of the first official British Chess Championship, in 1866.
He was born Valentine John Cecil De Vere Mathews in 1846; it is likely that he was the illegitimate son of William Cecil De Vere, a naval officer and son of the second Baronet of Curragh.
His mother was Katherine Mathews, a Welsh-born household servant.