"Once a Day" is a song written by Bill Anderson and recorded as the debut single by American country artist Connie Smith.

The song was released in August 1964, topping the Billboard country music chart for eight weeks between late 1964 and early 1965.

In 2020, "Once a Day" was deemed "culturally, historically, or aesthetically significant" by the Library of Congress and selected for preservation in the National Recording Registry.

Produced by Bob Ferguson, the session was accompanied by Nashville's "A-Team" of musicians, which included members of Anderson's touring band, The Po' Boys.

This longevity record stood unmatched until December 2012, when "We Are Never Ever Getting Back Together" by Taylor Swift overtook the achievement with nine weeks at No.

She did, however, top the country charts twice more in Canada, with her cover of Gordon Lightfoot's Ribbon of Darkness (1969) and the Everly Brothers' ('Til) I Kissed You (1976).

4 on the Billboard Country Chart, and a series of unbated top ten hits continued until mid-1968, including "If I Talk to Him", "Ain't Had No Lovin'", and "The Hurtin's All Over".