2019–20 Marsh One-Day Cup
| Dates | 21 September 2019 – 26 November 2019 |
|---|---|
| Administrator(s) | Cricket Australia |
| Cricket format | List A |
| Tournament format(s) | Round-robin tournament |
| Host(s) | Perth, Brisbane, Adelaide, Melbourne, Sydney, Gold Coast, Hobart |
| Champions | Western Australia (14th title) |
| Participants | 6 |
| Matches | 22 |
| Player of the series | Usman Khawaja & Marnus Labuschagne (QLD) |
| Most runs | Daniel Hughes (NSW) (440 runs) |
| Most wickets | Nathan Coulter-Nile (WA) (17 wickets) |
The 2019 Marsh One-Day Cup was the 51st season of the official List A domestic cricket competition in Australia. The tournament saw matches played in Perth, Brisbane, Adelaide, Melbourne, Sydney, Gold Coast, and Hobart. Fox Cricket broadcast thirteen matches from the tournament. The tournament was sponsored by Marsh & McLennan Companies, after previously being sponsored by Jardine Lloyd Thompson.
Western Australia won the tournament, after they beat Queensland by four wickets in the final.