2021 in the United States

Decades:	2000s; 2010s; 2020s; 2030s; ;
See also:	; History of the United States (2008–present); Timeline of United States history (2010–present); List of years in the United States;

This article outlines United States-related events which occurred in the year 2021.

The COVID-19 pandemic continued to heavily impact the US, with the emergence of numerous COVID-19 variants leading to a substantial rise in both infections and deaths across the country.

Though Donald Trump lost his bid to be re-elected president of the United States to former vice president Joe Biden, Trump's attempts to overturn the 2020 United States presidential election have continued throughout the year, most violent on January 6, when supporters of Trump stormed the Capitol building and unsuccessfully halted the formal counting of electoral votes in Congress. Much of the year, as well as 2022 in the United States, involved the aftermath of the attack itself (which included Trump's second impeachment, a first for a US president) and criminal trials of those at the Capitol, most of which has been carried out by a special committee in the House of Representatives.

2021 was additionally defined by protests against COVID-19 lockdowns in response to the pandemic, as well as the beginning of a period of high inflation and ongoing protests mostly against police brutality. The year also saw an extremely active Atlantic hurricane season, a destructive wildfire season in California, and a power crisis in Texas.