William Allan Thomson (4 August 1943 – 22 October 2019) was a New Zealand cricketer and hockey player. Thomson was an aggressive left-handed batsman who usually opened for Sydenham in Christchurch senior cricket in a career that produced more than 9000 runs over 25 seasons. He played first-class cricket twice: once for New Zealand Under-23 in 1964–65, and once for Canterbury nine seasons later in the Plunket Shield against Auckland when he scored 55 in the second innings; Canterbury had followed on 185 runs behind but went on to win by 26 runs. His brother Keith captained Canterbury in this match.