"It Wasn't Me" is a 2000 number one hit song by reggae artist Shaggy, featuring Ricardo "RikRok" Ducent. It achieved a huge success in many countries, topping the charts in the U.S., France, UK, the Netherlands, Austria, Australia and Ireland.

The song was originally never intended to be released as a single, MCA Records wanted "Dance and Shout" to be the first single released from the Hot Shotalbum and didn't offer other tracks to DJs. Hawaiian DJ Pablo Sato downloaded the album from "a Napster-like MP3 site he won’t name" and discovered it "was the album’s standout cut." He played the song on the radio the next day. "The phone lines lit up right away. Within a couple of days, it was our number-one requested song."

The lyrics depict one man (Rikrok) asking his friend (Shaggy) what to do after his girlfriend caught him with another woman. Shaggy's advice is to deny everything with the phrase "It wasn't me", despite all evidence to the contrary.

Two versions of the song and video exist: the radio and television edit version replace the lyric "Picture this; we were both butt-naked banging on the bathroom floor"with "Picture this; we were both caught making love on the bathroom floor."

The video starts out with Rikrok running to Shaggy's mansion to explain to him what just happened to him. Rikrok tells him that he cheated on his girlfriend and got caught. Shaggy tells him to tell her that "it wasn't me." The video then cuts into a flashback to earlier that day. Rikrok had been caught sleeping with another woman, and his girlfriend was outside the apartment in her convertible when two women pull up next to her on their motorcycles. The three women go into the building and Rikrok sneaks out the window, takes one of the motorcycles and leaves. The women come out and the girlfriend and one of the friends get in the convertible and the other women got on her motorcycle and chase after him. Shaggy, from his house, using his futuristic technology tracks down where Rikrok is going and prepares an escape for him. Rikrok then gets on a bridge over the highway when the friend rides on the bridge in front of him. He then hits the brakes to stop while she stops her motorcycle. Rikrok then hears a noise behind him and it's the other friends and the girlfriend driving the convertible on the other side of the bridge. On the highway below, an 18-wheeler drives by and Shaggy leaves him a text message telling him to look behind him. He notices the truck and jumps off the side of overhead and lands on the truck. He is then dropped off at Shaggy's mansion, showing the same scene from the start of the video.

The song was Shaggy's first number-one hit in the U.S., and the follow-up, "Angel," also reached number one. The single also reached number one in the UK Singles Chart on March 4, 2001, making the song a transatlantic chart topper. It also reached number one in Australia on April 1, 2001. It is also the 4th biggest selling single of the 21st century in the United Kingdom (the biggest selling single by a non-British artist). Prior to this the song reached number 31 on import sales in the UK before its release.

Like many popular songs of the time, "It Wasn't Me" was subject to parody. It was parodied on an episode of Svengoolie. It was also covered by Scrumpy and Western band the Wurzels.

The song's lyrics inspired Slatewriter Josh Levin to coin the term the "Shaggy defense" to describe R. Kelly's defense at his child pornography trial stemming from the production of a sex tape: "I predict that in the decades to come, law schools will teach this as the "Shaggy defense." You allege that I was caught on camera, butt naked, banging on the log cabin floor? It wasn't me." Levin repeated the term on NPR.

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