"Bad Boy" is a single by South Korean group Big Bang. It was released on February 29, 2012 by YG Entertainment, as the second single from their EP Alive. The track's R&B and hip hop sound was acclaimed by music critics, that consider it one of Big Bang's best songs. "Bad Boy" peaked at number two on South Korean's Gaon Digital Chart.

"Bad Boy" was the song to the featured on the teaser videos from Alive, after "Blue" and "Love Dust." The music video for the track was released on the same day as the album. The song charted at number one on online music charts after its release. The first televised performance was held at the music show Inkigayo on March 11. "Bad Boy" peaked at number two on the Gaon Digital Chart, after the group's own "Blue," and at number one on the Gaon Download Chart for two consecutive weeks. A Japanese version of the song was included at the Japanese studio albums Alive and The Best of Big Bang 2006-2014.

The song was penned by G-Dragon, who also produced the song with Choice37, and with additional rap parts written by T.O.P. "Bad Boy" is a piano-based R&B track. The production was noted for its roots "in the airiest of hip-hop/R&B summer crossover," for including tropical elements and was compared to the work of Boyz II Men and Justin Timberlake. The rapping parts were described as "mellow," which gave the song a "airy flow."Fuse described "Bad Boy" as a "unique mid-tempo track" that is "richly urban, set against a nostalgic '90s hip hop beat."

"Bad Boy" was filmed in a 90s throwback style, using 360-degree rotation-capable MK-V AR Steadicam’s Arri Alexa cameras. The shot took place in the New York City neighborhood Williamsburg, down by the Marcy Ave JMZ subway entrance. It reached 100 million views on YouTube on December of 2016, making Big Bang the first Korean boy band to have five music videos that have hit over 100 million viewers. Duncan Cooper from The Fader called the video "compelling and refreshingly unforced", writing that the group is "on the ground and they're walking the turf, and for four breezy minutes they're absolutely killing it."Popdust ranked "Bad Boy" fourteen in their list of 20 Best K-pop videos of 2012, commenting that the video "proves that sometimes less really is more."

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