"In da Club" is a hip-hop song performed by rapper 50 Cent from his commercial debut album Get Rich or Die Tryin'. The song was produced by Dr. Dre with co-production from Mike Elizondo. 50 Cent, Dr. Dre, and Elizondo wrote the song. The track was released in 2003 as the album's lead single and it was positively received by music critics.

"In da Club" became 50 Cent's first number one single and was one of 2003's most popular songs after reaching number one in the United States and peaking in the top five on the majority of the European record charts it entered. At the 46th Grammy Awards, it was nominated for Best Male Rap Solo Performance and Best Rap Song. The song's music video won Best Rap Video and Best New Artist at the 2003 MTV Video Music Awards. In 2009 the single was named the 24th most successful song of the 2000s, on the BillboardHot 100 Songs of the Decade.

After 50 Cent was discovered by rapper Eminem in 2002, he flew to Los Angeles where he was introduced to record producer Dr. Dre. "In da Club" was the first of seven tracks he recorded in five days with Dr. Dre. 50 Cent described the studio sessions, saying:

The production was originally given to the hip hop group D12, but was passed on to 50 Cent. He recorded the track with only the drum beat present. Since much of the content on Get Rich or Die Tryin'was "dark", he wanted to write material that was "the exact opposite". He called the song a "celebration of life. Every day it's relevant all over 'cause every day is someone's birthday."

"In da Club" was positively received from music critics. Allmusic described it as "a tailor-made mass-market good-time single". The Sourcecalled the song a "guaranteed party starter" with its "blaring horns, funky organs, guitar riffs and sparse hand claps". The BBC also wrote that the song is "a spectacular party anthem" that "highlights 50 Cent's ability to twist his words effortlessly". Entertainment Weeklynoted that 50 Cent "boasts unashamedly of his career objectives and newly flush bank account" with lyrics such as "I'm feelin' focus, man, my money on my mind/Got a mil out the deal and I'm still on the grind." Rolling Stonewrote that the song sports "a spare yet irresistible synth hook augmented by a tongue-twisting refrain". The Guardiancalled the track "irresistible" due to its "sparse orchestral samples and snaking chorus" and Pitchfork Media also said "the bounce on 'In Da Club' is straight-up irresistible, Dre at both his minimalist best and most deceptively infectious." Splendidmagazine called the song an "insanely catchy" single with its "stanky, horn-addled thump". The track was listed at number ten on Blendermagazine's "The 500 Greatest Songs Since You Were Born". In 2008, it was ranked at number 18 on VH1's "100 Greatest Hip Hop Songs".

"In da Club" charted well in the United States, becoming 50 Cent's first number one single. The song peaked at number one for nine weeks on the Hot 100 (starting on February 27, 2003) and remained on the chart for twenty-two weeks. The track also reached number one on the Top 40 Tracks, Hot R&B/Hip-Hop Songs, and Hot Rap Tracks charts. In March 2003, it broke a Billboardrecord as the "most listened-to" song in radio history within a week. "In da Club" was certified Gold by the Recording Industry Association of America and was nominated for Best Male Rap Solo Performance and Best Rap Song at the 2004 Grammy Awards, but lost to Eminem's "Lose Yourself". Across Europe, the song reached number one in Denmark, Germany, Ireland, and Switzerland and the top five in Austria, Belgium, Finland, Greece, Norway, Sweden, the Netherlands, and the United Kingdom. In Australia, the single peaked at number one, was certified two times Platinum by the Australian Recording Industry Association, and on the 2003 year-end chart, it was listed at number five.

The music video was directed by Phillip Atwell on December 10 – December 11, 2002. Almost all the film footage was used in the video except for a scene where 50 Cent raps in a glass box. The video is set in a fictional hip hop boot camp known as the Shady/Aftermath Artist Development Center. It begins with a black Hummer driving to the facility at an unknown location. 50 Cent is introduced by hanging upside down from the roof of a gym. Atwell commented, "I think I could have done better with it, but I really liked the way that it turned out". The video also contains a shooting range, which Atwell felt was appropriate because 50 Cent had been shot nine times. He said, "creatively, I felt like we were able to put guns in a video and have it play. And I like it when you are able to play within the standards and still give the artist something symbolic of what they are going for."

The video ends with the camera zooming out of the club to reveal a two-way mirror with Eminem and Dr. Dre in white lab uniforms, observing 50 Cent and taking notes. Atwell stated that "seeing 50 with Dre and Em having his back is as big a visual statement as it is a musical statement" and the shot was significant because it made clear the club was inside the center and not unrelated performance footage. On January 27, 2003, the video debuted on MTV's Total Request Liveat number nine and stayed on the chart for fifty days. It also reached number one on the MuchMusicvideo charts. At the 2003 MTV Video Music Awards, the video was awarded Best Rap Video and Best New Artist and was nominated for Video of the Year, Best Male Video, and Viewer's Choice.

In January 2006, 50 Cent was sued for copyright infringement by former 2 Live Crew manager Joseph Weinberger, who owns the rights to the rap group's catalog. He claimed that 50 Cent plagiarized the lines "it's your birthday" from former 2 Live Crew frontman Luther Campbell on his 1994 album Still a Freak for Life. The lawsuit was dismissed by U.S. District Judge Paul Huck, who ruled that the phrase was a "common, unoriginal and noncopyrightable element of the song".

Information taken from the liner notes of Get Rich or Die Tryin'.

Beyoncé Knowles released a remix cover version of the song titled "Sexy Lil Thug" that is sung from a girls perspective. The song follows the same instrumentals and melody as the original and cuts in at 3:13. Her version was often merged with the original in the clubs and on radio play. The remix of the song featuring 50 Cent, Lil Boosie, & Max Manelli was found in the mixtape "Speak My Mind". There is another version of this song that has 50 Cent's intro (the dropping coin being inserted to a slot) from the album, and the intro & 2nd verse from "In Da Club", it was found the 1st promotional CD of "Dangerously In Love", it's the official remix to "In Da Club".