1940 Australian Championships – Mixed doubles
# 1940 Australian Championships – Mixed doubles

The fourth seeds Nancye Wynne and Colin Long started their streak of four consecutive Australian Mixed Doubles titles by defeating the defending champions Nell Hopman and Harry Hopman 7–5, 2–6, 6–4, to win the mixed doubles tennis title at the 1940 Australian Championships.

## Seeds

* Nell Hopman / Harry Hopman (final)
* Joan Hartigan / Vivian McGrath (semifinals)
* May Hardcastle / John Bromwich (semifinals)
* Nancye Wynne / Colin Long (champions)

## Draw

### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Draw

| First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 2 | Joan Hartigan Vivian McGrath | 6 | 6 | | | | | | | | | | | | | | | |
| | Alison Hattersley Les Hancock | 4 | 4 | 2 | Joan Hartigan Vivian McGrath | 6 | 6 | | | | | | | | | | | |
| | Olive Stebbing Jim Gilchrist | 6 | 6 | | Olive Stebbing Jim Gilchrist | 3 | 2 | | | | | | | | | | | |
| | Rosemary Rees Max Newcombe | 4 | 2 | | | | | | 2 | Joan Hartigan Vivian McGrath | 6 | 4 | 3 | | | | | |
| 4 | Nancye Wynne Colin Long | 6 | 6 | | | | | | 4 | Nancye Wynne Colin Long | 4 | 6 | 6 | | | | | |
| | Gwen O'Halloran Fred Bennett | 1 | 3 | 4 | Nancye Wynne Colin Long | 6 | 6 | | | | | | | | | | | |
| | Edie Niemeyer Bill Sidwell | 6 | 6 | | Edie Niemeyer Bill Sidwell | 3 | 3 | | | | | | | | | | | |
| | Kath Woodward Max Bonner | 3 | 4 | | | | | | | | | | | 4 | Nancye Wynne Colin Long | 7 | 2 | 6 |
| | | | | | | | | | | | | | | 1 | Nell Hopman Harry Hopman | 5 | 6 | 4 |
| | | | | | Audrey Lewin Bert Felan | 2 | 6 | 1 | | | | | | | | | | |
| | | | | 3 | May Hardcastle John Bromwich | 6 | 4 | 6 | | | | | | | | | | |
| | | | | | | | | | 3 | May Hardcastle John Bromwich | 7 | 7 | 2 | | | | | |
| | Mary Chapman Don Turnbull | 6 | 6 | | | | | | 1 | Nell Hopman Harry Hopman | 9 | 5 | 6 | | | | | |
| | Connie Coate Harold Whillans | 2 | 3 | | Mary Chapman Don Turnbull | 4 | 2 | | | | | | | | | | | |
| 1 | Nell Hopman Harry Hopman | 6 | 6 | 1 | Nell Hopman Harry Hopman | 6 | 6 | | | | | | | | | | | |
| | Clare Proctor Jack Cummings | 2 | 4 | | | | | | | | | | | | | | | |
