"The Best Day" is a song written by Dean Dillon and Carson Chamberlain, and performed by American country music singer George Strait. It was released in January 2000 as the first single from his compilation album Latest Greatest Straitest Hits. The song reached the top of the Billboard Hot Country Singles & Tracks chart.

Larry Flick, of Billboard magazine reviewed the song favorably, calling it a "well-written tale that listeners will find easily relatable, and the chorus makes this the ultimate feel-good tune to kick off the millennium." He goes on to say that Strait's "warm-throated delivery is all honest emotion."

The song entered the Hot Country Singles & Tracks chart at number 48 on the chart dated January 1, 2000, and spent 29 weeks on the chart. The song also climbed to number 1 after spending 17 weeks on the chart, where it held number 1 for three weeks on the chart dated April 22, 2000. In addition, this song became Strait's 36th Billboard Number One as a solo artist.