William Fennex (born c.1763 at Gerrards Cross, Bucks; died 4 March 1838 at Stepney, London) was a famous English cricketer. He was a noted all-rounder and right arm fast bowler. As a batsman, Fennex was reputed to be one of the first to use forward play and was said to be a good driver of the ball.
His playing career began with Berkshire in 1785 but he was chiefly associated with Middlesex and was keeper of the ground at Uxbridge. He made 85 known first-class appearances until 1800 and then played occasionally, making nine more appearances from 1802 to 1816.
He played for the Players in the inaugural Gentlemen v Players match in 1806.[1]
Like William Beldham, he subsequently provided James Pycroft with his reminiscences.