"Baby Blue" is a song by American rapper Action Bronson. It was released on March 3, 2015 as the fourth and final single off his second album Mr. Wonderful (2015). It features a guest appearance from fellow rapper Chance the Rapper. It was co-written by both artists, along with Zane Lowe (who co-wrote the chorus) and Mark Ronson, who also produced the song. A hip hop breakup song, "Baby Blue" is the closer to a three-part suite along with "City Boy Blues" and "A Light in the Addict" that's preluded by the album's interlude, "Thug Love Story 2017 The Musical".

The song received mixed reviews from critics who praised Chance's verse but questioned Bronson's musicianship. "Baby Blue" was Bronson's first solo appearance on the Billboard Hot 100, debuting at number 91 for one week. It also charted at numbers 21 and 30 on the Hot Rap Songs and Hot R&B/Hip-Hop Songs charts respectively. The accompanying music video for the song, directed by Lil Chris, was released on Bronson's YouTube page as part of the 2015 YouTube Music Awards and pays homage to the 1988 Eddie Murphy comedy Coming to America.

Following the album's first single "Easy Rider" and the digital release of "Actin' Crazy", Bronson revealed the track list for Mr. Wonderful and showed which songs had collaborations to them. "Baby Blue" was produced by Mark Ronson, who previously did production for singers like Daniel Merriweather and Bruno Mars. The song was written by Ronson, Arian Arslani, Chancellor Bennett and Zane Lowe. It acts as the closer to a three-part suite set by "City Boy Blues" and "A Light in the Addict" that was preluded by the album's interlude, "Thug Love Story 2017 The Musical", about an elderly man singing to Bronson about a former love that left the streets.

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