The 1938 Australian Championships was a tennis tournament that took place on outdoor Grass courts at the Memorial Drive, Adelaide, Australia from 21 January to 31 January. It was the 31st edition of the Australian Championships (now known as the Australian Open), the 7th held in Adelaide, and the first Grand Slam tournament of the year. The singles titles were won by Americans Don Budge and Dorothy Bundy Cheney.
See main article: 1938 Australian Championships – Men's singles. 
Don Budge defeated 
John Bromwich 6–4, 6–2, 6–1
See main article: 1938 Australian Championships – Women's singles. Dorothy Bundy defeated Dorothy Stevenson 6–3, 6–2
See main article: 1938 Australian Championships – Men's doubles. John Bromwich / Adrian Quist defeated Gottfried von Cramm / Henner Henkel 7–5, 6–4, 6–0
See main article: 1938 Australian Championships – Women's doubles. Thelma Coyne / Nancye Wynne defeated Dorothy Bundy / Dorothy Workman 9–7, 6–4
See main article: 1938 Australian Championships – Mixed doubles. Margaret Wilson / John Bromwich defeated Nancye Wynne / Colin Long 6–3, 6–2