1931 Australian Championships – Mixed doubles

Nell Hall and Harry Hopman were the defending champions and the second seeds, but they lost in the semifinals.

The first-seeded Marjorie Crawford and Jack Crawford defeated unseeded Emily Hood Westacott and Aubrey Willard 7–5, 6–4 in the final, to win the mixed doubles tennis title at the 1931 Australian Championships.

Seeds

 * 1) 🇦🇺 Marjorie Crawford / 🇦🇺 Jack Crawford (champions)
 * 2) 🇦🇺 Nell Hall / 🇦🇺 Harry Hopman (semifinals)
 * 3) 🇦🇺 Louie Bickerton / 🇦🇺 James Willard (quarterfinals)
 * 4) 🇦🇺 Sylvia Harper / 🇦🇺 Gar Moon (quarterfinals)