In the United States, open carry refers to the practice of visibly carrying a firearm in public places, as distinguished from concealed carry, where firearms cannot be seen by the casual observer. To "carry" in this context indicates that the firearm is kept readily accessible on the person, within a holster or attached to a sling. Carrying a firearm directly in the hands, particularly in a firing position or combat stance, is known as "brandishing" and may constitute a serious crime, but that is not the mode of "carrying" discussed in this article.

The practice of open carry, where gun owners openly carry firearms while they go about their daily business, has seen an increase in the United States in recent years, and is a hotly debated topic in gun politics. This has been marked by a number of organized events intended to increase the visibility of open carry and public awareness about the practice. Proponents of open carry point to history and statistics, noting that criminals usually conceal their weapons, in contrast to the law-abiding citizens who display their weapons. As of 2022, almost all US states allow for open carry either without a permit or with a permit/license.

The gun rights community has become supportive of the practice, while gun control groups are generally opposed.