"I Swear" is a ballad written by Gary Baker and Frank J. Myers that became a hit for two acts in 1994. Initially, it was a number-one single on the U.S. Hot Country Singles & Tracks chart for American country music artist John Michael Montgomery at the beginning of the year. His version crossed over to pop radio and climbed to number 42 on the Billboard Hot 100. A few months later, American pop group All-4-One covered the song and achieved great success in many countries. In Latin America it has been translated "Juraré" performed by the Costa Rican group Centinelas Vocal Band. In 1998, the Mexican country band Caballo Dorado recorded a Spanish version called "Ya sé".

The song is a ballad in which the narrator promises his significant other that he will always love her.

The music video was directed by Marc Ball and premiered in late 1993.

"I Swear" debuted on the U.S. Billboard Hot Country Songs for the week of December 18, 1993.

Several months after John Michael Montgomery had released his original version, All-4-One recorded their own version with record producer David Foster.

All-4-One's version hit number one in numerous countries, including the Billboard Hot 100 in the U.S., where it remained for eleven consecutive weeks. It peaked at number two on the UK Singles Chart, where it stayed for seven consecutive weeks, being held off number one by Wet Wet Wet's "Love Is All Around", which went on to spend 15 weeks at number one. This version spent a total of 18 weeks in the UK charts.

The All-4-One version of the song is slightly different to the original, in that the line "And when there's silver in your hair" from the second verse was replaced by "And when just the two of us are there." This version ranks number 88 on Billboard's All-Time Top 100 Songs list.

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