"Knocked Out" is a 1988 pop/R&B song by the American singer Paula Abdul, released on May 4, 1988. It was the first song from her first album, Forever Your Girl. It was written by Babyface, L.A. Reid and Daryl Simmons and produced in 1987 by the former two.

The song was originally included on a Virgin Records sampler for the launch of Virgin Records America. In spring 1988, it was released as a single to test Abdul's commercial appeal. "Knocked Out" proved to be very successful for a low budget single; it became a top 10 R&B hit.

In the UK, "Knocked Out" was released three times. It was Abdul's first single and charted on September 24, 1988, peaking at a lowly #98. Following the success of "Straight Up" and its follow-up, "Forever Your Girl", "Knocked Out" was reissued and peaked at #41 on 19 August 1989. Finally, after the huge success of "Opposites Attract" in 1990, the single was extensively reworked by Shep Pettibone and it entered the UK Top 30, peaking at #21 on July 28, 1990.

The remixed version of "Knocked Out" which was released in the UK as well as Germany was from the Shut Up and Dance remix album. While this version was not issued as a single in the United States, it did receive significant airplay and just missed the American Top 40, peaking at #41.

The original "Knocked Out" video was directed by Danny Kleinman. It showed Abdul and a large number of dancers working out dance routines on the dance floor. For the second release, a revamped video was made and released without Abdul actually in it. This video was plotted around a boxing match, while screen caps of Abdul's other videos were played in the background.

Cover Version in 1990, Hong Kong singer Vivian Chow covered this song in Cantonese.

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