"Fergalicious" is a song recorded by American singer and rapper Fergie for her debut studio album, The Dutchess (2006). The title is a portmanteau of Fergie and delicious. It was written by Fergie and The Black Eyed Peas groupmate will.i.am, who also produced the song as well as providing the instrumentation and additional vocals. The song was slated as the second single from the album and released for airplay on October 23, 2006. "Fergalicious" is an electro song with R&B and hip hop characteristics. It contains compositional samples of "Supersonic", a song written by Dania Maria Birks, Juana Michelle Burns, Juanita A. Lee, Kim Nazel, and Fatima Shaheed and performed by J. J. Fad, and "Give It All You Got", a song written by Derrick Rahming and popularized by Afro-Rican. The song's bridge contains an interpolation of "Night Train" by Jimmy Forrest and James Brown. The critical reception of "Fergalicious" was positive, with many praising it as a catchy and danceable track. Some music critics compared the song to "My Humps" (2006), a single released by The Black Eyed Peas from their fourth studio album Monkey Business (2005).

"Fergalicious" was a commercial success in the United States and moderately so in several other countries. In the United States, it peaked at number two on the Billboard Hot 100 and at number one on the Pop Songs chart. "Fergalicious" was certified double platinum by the Recording Industry Association of America and sold over three million digital units, becoming Fergie's second best selling song in the United States. In Australia and New Zealand, the song peaked at numbers four and five respectively and received gold certifications. In Europe, the song peaked within the top thirty on several different charts across the continent, including high positions in Finland, Norway, Belgium and France. An accompanying music video was directed by Fatima Robinson and features Fergie and will.i.am in a candy factory, supposedly inspired by Willy Wonka.

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