"Can't B Good" is a song by American recording artist Janet Jackson, taken from her tenth studio album Discipline (2008). The song was written and produced by D. DoRohn Gough and Ne-Yo, and was released as the fourth and final single from Discipline on March 18, 2008. The song is a soulful, "jazzy" R&B track about Jackson's relationship with Jermaine Dupri.

The song received mostly positive reviews from music critics, who praised it for being smooth, tender and lovely, and picked the song as one of the best tracks on Discipline, with some others comparing the song to "Human Nature" (1983), performed by her brother Michael Jackson. Commercially, the song only managed to reach number 76 on the US Hot R&B/Hip-Hop Songs chart.

"Can't B Good" was written and produced by D. DoRohn Gough and Ne-Yo. It was recorded between 2007 and 2008 at SouthSide Studios, in Atlanta, Georgia. Although Jackson didn't write the song, Jackson described "Can't B Good" as a song reflecting her seven-year relationship with songwriter/producer Jermaine Dupri, saying, "I'd been hurt before, and I was trying to protect myself. I'm glad I allowed myself to accept it. He's very attentive and affectionate, a beautiful soul".

Princess P. from MWZA described the lyrics as "standard falling-in-love-too-deep far", with the thwack of the snare contrasting heavily with the layers of cooing vocals. Musically, the song is a midtempo "smooth and jazzy" R&B ballad, featuring thundering bass, piano, with eighties keyboard sounds and cooing harmonies. Princess P. from MWZA wrote the song resembles "Aaliyah's "Rock the Boat" with a more "punishing" beat, Michael Jackson's "Butterflies" (2001) and Janet Jackson's own track "Spending Time With You" from Damita Jo (2004).

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