List of Billboard number-one country songs of 2021

Hot Country Songs and Country Airplay are the two main charts that rank the top-performing country music songs in the United States, published by Billboard magazine. Hot Country Songs ranks songs based on digital downloads, streaming, and airplay not only from country stations but from stations of all formats, a methodology introduced in 2012.[1] Country Airplay, which began being published in 2012, is based solely on country radio airplay, a methodology that had previously been used from 1990 to 2012 for Hot Country Songs.[1]

The year began with Gabby Barrett continuing a record-breaking run at number one on the Hot Country Songs chart.

In the issue of Billboard dated January 2, "Big, Big Plans" by Chris Lane returned to number one on the Country Airplay chart, having previously been number one for the chart dated December 19, 2020, while "I Hope" by Gabby Barrett held the number one spot on Hot Country Songs, the song's 22nd week atop the chart.[2][3] Barrett thus continued to extend her record for the longest-running number one song on that chart by a solo female artist, having broken the record two weeks earlier.[4] The song was displaced from the top spot in the issue dated January 23 by Morgan Wallen's "Wasted on You", but went back to number one the following week.