"Weird Al" Yankovic in 3-D (often referred to simply as In 3-D) is the second studio album by the American parody musician "Weird Al" Yankovic, released on February 28, 1984, by Rock 'n Roll Records. The album was one of many produced by former McCoys guitarist Rick Derringer. Recorded between October and December 1983, the album was Yankovic's follow-up to his modestly successful debut LP, "Weird Al" Yankovic.

The album is built around parodies and pastiches of pop and rock music of the mid-1980s. Half of the album is made up of parodies of artists like Michael Jackson, Men Without Hats, the Greg Kihn Band, the Police, and Survivor. The other half of the album contains many "style parodies", musical imitations that come close to but do not directly copy a specific work by existing artists. These style parodies include imitations of artists such as Bob Marley and the B-52s. This album marked a musical departure from Yankovic's self-titled debut, in that the arrangements of the parodies were now closer to the originals. Also, the accordion was no longer used in every song, but only where deemed appropriate or comically inappropriate. The album is also notable for being the first album released by Yankovic to include a polka medley of hit songs. A similar pastiche of hit songs, set to polka music, has since appeared on nearly all of Yankovic's albums.

"Weird Al" Yankovic in 3-D was met with mostly positive reviews and peaked at number seventeen on the Billboard 200 and number sixty-one in Australia. The album also produced one of Yankovic's most famous singles, "Eat It" (a parody of Michael Jackson's "Beat It"), which peaked at number twelve on the Billboard Hot 100. This song was Yankovic's highest-charting single until "White & Nerdy" from his 2006 album Straight Outta Lynwood peaked at number nine in the October 21, 2006 Billboard charts. "Eat It" also charted at number one in Australia, making it Yankovic's only number one single in any country. The album also produced two minor US hits, "King of Suede", which peaked at number sixty-two, and "I Lost on Jeopardy", which peaked at number eighty-one. The album was Yankovic's first Gold record, and went on to be certified Platinum for sales of over one million copies in the United States. "Eat It" won a Grammy Award for Best Comedy Performance Single or Album, Spoken or Musical in 1985.