2021 United States inauguration week protests

Supporters of Donald Trump, the 45th president of the United States, held small-scale armed protests and demonstrations at U.S. state capitols in the five days leading up to the inauguration of Joe Biden on January 20, 2021, in opposition to the results of the 2020 United States presidential election, which continued after the failure of the violent January 6 attempt to overturn the election in Trump's favor. Pro-Trump groups failed to stage organized dissent or affect the transition of power in an environment of deterrence and heightened security.

Fears of violent protests after a January 11 FBI warning led to a drastic increase in security at state capitols and the United States Capitol, which served as the site of the presidential swearing-in ceremony. Increased monitoring and police presence, closures of public buildings, curfews, temporary fencing, and other security measures were employed in response to the security threat. The United States Capitol was put under the protection of members of the National Guard, which was additionally activated in at least 19 states, to protect state capitols.

The protests featured the participation of far-right militia groups that follow right-libertarianism, neo-fascism, neo-Nazism, white supremacism, and other ultranationalist or right-wing ideologies, as well as members of the New Black Panther Party, and the QAnon and boogaloo movements. On January 31, 2021, detailed overviews of attempts to subvert the 2020 U.S. presidential election and Biden's inauguration were published by The New York Times.