"Baby Boy" is a song by American singer-songwriter Beyoncé from her debut solo studio album, Dangerously in Love (2003). It features Jamaican singer Sean Paul and is also on his Grammy Award-winning album Dutty Rock, which was re-released in 2003. The artists co-wrote the song with Jay-Z, Robert Waller, and Scott Storch; the latter is also the producer. Containing a lyrical interpolation of "No Fear" by hip hop group O.G.C, "Baby Boy" is an R&B and dancehall song with reggae and Arabic music influences; its lyrics detail a woman's fantasies.

Columbia Records released "Baby Boy" as the second single from Dangerously in Love to United States radios on August 3, 2003. "Baby Boy" topped the US Billboard Hot 100 chart for nine consecutive weeks, and was Beyoncé's longest-running solo number-one single until 2007. It reached the top ten in many countries, and was certified platinum in Australia and the US.

The song's music video was directed by Jake Nava and mostly shows Beyoncé dancing in various locations. "Baby Boy" has remained a staple of Beyoncé's concert set list. The American Society of Composers, Authors, and Publishers (ASCAP) recognized it as one of the most performed songs of 2005. During the same year, US singer-songwriter Jennifer Armour filed a copyright infringement lawsuit claiming that the song had used the primary musical hook from her song "Got a Little Bit of Love for You". The suit was dismissed.

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