2020 Iowa Democratic presidential caucuses

The 2020 Iowa Democratic presidential caucuses, the first nominating contest in the Democratic Party primaries for the 2020 presidential election, took place on February 3, 2020. Pete Buttigieg received the most state delegate equivalents (SDEs) and therefore the most delegates, with one SDE and two delegates more than Bernie Sanders, who had narrowly won the popular vote with 26.5%. It was the first time that the Iowa caucuses published the popular vote results of their contest. Buttigieg became the first openly gay person to ever earn the most delegates in a state's presidential contest in the United States. The Iowa caucuses were closed caucuses, wherein only registered members of a party were eligible to vote, and awarded 49 delegates to the 2020 Democratic National Convention, of which 41 were pledged delegates allocated on the basis of the results of the caucuses.

The 2020 Iowa Democratic caucuses were controversial due to the delays in reporting the results. These delays, caused in part by problems with a mobile application created by Shadow Inc. that was used to report voting totals, led to the resignation of Iowa Democratic Party chair Troy Price. Further controversy resulted from errors and inconsistencies regarding the calculation and reporting of State Delegate Equivalents (SDEs) in several caucus locations. Following a three-day delay in vote reporting, the Iowa Democratic Party declared that Buttigieg had won two more delegates than Sanders.

The official result and calculation of pledged national convention delegates was delayed until six days after the election due to the need for a correction of reported results from 3.1% (55) of the precincts. Buttigieg and Sanders then requested a partial recanvass for 8.1% of the official result, which resulted in Buttigieg's lead over Sanders narrowing to 0.08 SDEs. A final recount for 63 of the recanvassed precincts (3.6% of all results) was requested by both campaigns on February 19. Two days later, the Iowa Democratic Party announced that it had accepted recount requests for 23 precincts (1.3% of all results). The recounts took place from February 25 to February 27, with the Iowa Democratic Party announcing the results of the recounts on February 27, 2020. The results were certified by the state committee on February 29. The Associated Press at that point still refused to call a winner due to too many discrepancies in the precinct vote records, though they acknowledged the official results in their delegate count, and Sanders challenged the results after certification before the DNC Rules and Bylaws Committee, but there were no media reports about the outcome of that challenge.

Despite his underperformance, Joe Biden would go on to win the nomination, becoming the first Democratic candidate to do so without winning Iowa since Bill Clinton in 1992. Additionally, with Biden defeating incumbent president Donald Trump in the general election, he became the first candidate to do so without finishing in the top 3 in Iowa since the conception of the caucuses in 1972.