The dollar coin is a United States coin with a face value of one United States dollar. Dollar coins have been minted in the United States in gold, silver, and base metal versions. Dollar coins were first minted in the United States in 1794.

While true gold dollars are no longer minted, the Sacagawea, Presidential, and American Innovation dollars are sometimes referred to as golden dollars because of their color. As with several other denominations of U.S. coinage, golden dollars are similar in diameter and color to their Canadian counterpart (known as the "loonie," which predates the Sacagawea dollar by thirteen years). However, unlike the 11-sided Canadian dollar coins, U.S. "golden dollar" coins are round.

Dollar coins have never been popular in the United States since the removal of precious metal from coins. Despite efforts by the government to promote their use to save the cost of printing one-dollar bills, such as the Presidential $1 Coin Program, most Americans currently use the bill. For this reason, since December 11, 2011, the Mint has not produced dollar coins for general circulation, and all dollar coins produced after that date have been specifically for collectors. These collector coins can be ordered directly from the Mint, while pre-2012 circulation dollars can be obtained from most U.S. banks.