Denis Leng (born 26 November 1934 in Pudsey, Yorkshire, England) is an English-born Irish former cricketer. A right-handed batsman and right-arm fast-medium bowler, he played six times for the Ireland cricket team between 1966 and 1968 including one first-class match. He made his debut for Ireland in September 1966 against the MCC in what was his only first-class match. He played three matches for Ireland in 1967, against Worcestershire, the MCC and the Combined Services. He played twice against Australia in July 1968, which were his last matches for Ireland.