Spencer Henry Johnson (born 16 December 1995) is an Australian cricketer who plays domestically for South Australia. A left-arm fast bowler, Johnson made his List A debut on 12 October 2017 for South Australia against Victoria. He made his First class debut on 20 February 2023 for South Australia in the 2022–23 Sheffield Shield season tournament. In March 2023, Johnson was named in an Australia A squad to tour New Zealand in the lead up to the 2023 Ashes series.Johnson played the first match of the tour in Lincoln, taking 4/53 in the first innings. In August of the same year, Johnson was selected in a 14-player squad for Australia's T20I series against South Africa.He made his international debut in the first match, taking 2/33 in a 111-run win. In February 2024, he was selected in Australia's squad for the T20 series against West Indies.In the second match of the series, he took 2 wickets for 39 runs.