"I Know" is the debut solo single by American singer-songwriter Philip Bailey, released in 1983 by Columbia Records. The song reached No. 10 on the Billboard Hot Black Singles chart.
"I Know" was produced by George Duke and composed by Gerard McMahon.
The single's B-side is "The Good Guy's Supposed to Get the Girls". Both "I Know" and "The Good Guy's Supposed to Get the Girls" are from Bailey's 1983 album Continuation.
Eleanor Levy of Record Mirror claimed, "This first solo single from Earth, Wind And Fire's lead singer is just what you'd expect - a pleasant melody, beautifully performed. No surprises but a lot of class." Paul Willistein of The Morning Call proclaimed that George Duke's "keyboard and synthesizer part turn I Know into (Continuation)'s best cut".