"Dirty Diana" is a song by American songwriter and recording artist Michael Jackson that is featured on Jackson's seventh studio album, Bad. The song was released by Epic Records on April 18, 1988 as the fifth single from Bad. The song presented a harder rock sound similar to that of "Beat It" from the album Thriller. "Dirty Diana" was written, composed, and co-produced by Jackson, and produced by Quincy Jones. The songs lyrics pertain to groupies. "Dirty Diana" has a moderate tempo and is played in the key of G Minor.

"Dirty Diana" was generally well received by contemporary music critics. The song was also a commercial success worldwide in 1988, charting at number one on the United States Billboard Hot 100, The song also charted within the top ten in multiple countries, including the United Kingdom, France, Italy and New Zealand. "Dirty Diana" was the fifth and final number-one single on the Hot 100 from Bad. In 2009, after Jackson's death in June, the song re-entered charts, mainly due to digital download sales. A music video for "Dirty Diana" was filmed in front of a live audience and was released in 1988.