This list of birds of Missouri includes species documented in the U.S. state of Missouri and accepted by the Missouri Birding Society (MBS). As of July 2021, there are 437 species included in the official list. Of them, 54 are classed as accidental, 31 are classed as casual, 11 are classed as provisional (see below), seven have been introduced to North America, four are extinct and one might be, and three have been extirpated.