"I Do" is a song written and recorded by American singer/ songwriter Lisa Loeb. Released October 1997 as the lead single from her second album Firecracker, "I Do" peaked at #17 on the Billboard Hot 100, becoming Loeb's most successful single after her #1 debut "Stay (I Missed You)" (1994), Loeb's one interim Top 40 hit "Do You Sleep?" having peaked at #18. In Canada "I Do" afforded Loeb her second #1 hit, "Stay (I Missed You)" being the first.

On the surface, the song seems to be about "the realization that a person isn't right for you, that the relationship has gone bad". However, the real intention of the song is quite different according to the liner notes for The Very Best of Lisa Loeb: "We were almost finished recording the album, Firecracker, and the record company told us that we still needed a single. I decided to write a song that sounded like a song about a relationship but was actually about the record company not 'hearing' a single on the record already. You can hear it in the lyrics, 'You can't hear it, but I do.' The song ended up being an expression of strength and power even when someone's not treating you right."

The song was warmly greeted by Billboard who called the melody and chorus "nothing short of pure pop bliss."

In the music video, directed by Phil Harder, it shows scenes of Loeb in black and white singing on an upside-down microphone and also lies down on the feather floor (like in the album's cover) then in the singing studio. It even features paintings of her as well as the lyrics in some scenes (during Pop-up Video, the words would pop up in the same font as the words in the drawings, and the "I will" parts have the percentages).

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