The 2020 Wisconsin Democratic presidential primary took place on April 7, 2020, in the midst of the global COVID-19 pandemic, along with the Wisconsin Supreme Court Justice election, as part of the Democratic Party primaries for the 2020 presidential election. The Wisconsin primary was an open primary, with the state awarding 97 delegates to the 2020 Democratic National Convention, of which 84 were pledged delegates allocated on the basis of the results of the primary. Although all forms of voting had to take place on or until April 7, full results were not allowed to be released before April 13, in accordance with a district court ruling.

The global COVID-19 pandemic struck the U.S. state of Wisconsin in early February 2020. Although Wisconsin has to date experienced 144 deaths per 100,000 residents, significantly fewer than the US national average of 196 deaths, COVID-19 was one of the three leading causes of death in Wisconsin in 2020. On August 25, 2021, Wisconsin public health authorities reported 7 day averages of 1,417 new cases and 236 probable cases per day, an increase of greater than 15 fold since late June 2021. This brings the cumulative total of COVID-19 cases in Wisconsin to 651,338. The state's death toll is 7,558, with 30 new deaths over the previous 7 days. As of August 25, 2021, 12.41% of Wisconsin's residents have been positively diagnosed with COVID-19, the 20th highest per-capita case rate among all US states. January 16's 128 COVID-19 deaths set a new single day record for Wisconsin.