"Fantastic Baby" is a song recorded by South Korean group Big Bang for their fourth extended play Alive (2012) and released as third single of the record by YG Entertainment. A music video for the song was released on March 7, 2012. An electropop and EDM song with an anarchistic theme, "Fantastic Baby" is known for being "one of the biggest K-pop hits ever" and its music video is the most-watched by a K-pop group in YouTube. The single went on to sell more than four million copies in South Korea and six million across Asia, becoming one of the best-selling digital singles of all-time.

"Fantastic Baby" was release as a single in March 2012. A teaser of the music video was released on the music show Inkigayo on March 4, 2012 and the full video was published on YouTube two days later. The first performance of the song was made in their concert Big Show 2012 in Seoul. A Japanese-language version was released in March, on the Japanese version of Alive. The song was translated by the Korean-Japanese member of M-Flo, Verbal. This version was also included in the 2014 greatest hits album The Best of Big Bang 2006-2014.

Written and produced by G-Dragon and Teddy Park, with additional rap parts penned by T.O.P, "Fantastic Baby" is an anarchistic dance, EDM, hip hop and electropop track that was described as an "full-on banger" with a "boisterous, genre-blending sound."NME compared the single to the music from the 1960s band Sly and the Family Stone.

After four days from releasing the album, the song debuted at number four in the Gaon Digital Chart, charting behind Big Bang's songs "Blue," "Bad Boy" and "Love Dust", selling 450,021 copies. In the next week, the song rose to number three, selling 362,298 copies. The single was the best-selling song of March 2012, reaching 1,351,429 downloads and charting first in the Digital Chart for the month. The song was the fifth best selling single of the year, selling 3,339,871 copies in South Korea. As of September 2016, Fantastic Baby reached 4 million downloads in South Korea, the best-selling boy group song on Gaon Chart.

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