Gwen Renée Stefani Rossdale (pronounced /ˈɡwɛn stɛˈfɑːni/; born October 3, 1969) is an American singer and fashion designer. Stefani serves as lead vocalist for the rock band No Doubt. With previous material ranging from punk rock to new wave music, their third wave ska oriented third studio album Tragic Kingdom (1995) propelled them to stardom, selling 16 million copies worldwide. It spawned the singles "Just a Girl", "Spiderwebs", and "Don't Speak". The band's popularity went into decline with its fourth album, Return of Saturn (2000), but Rock Steady (2001) focused on dancehall production traits, and generally received positive reviews.

Stefani recorded her first solo album Love. Angel. Music. Baby. in 2004. The album was primarily inspired by music of the 1980s, and emerged an international success with sales of over seven million. The album's third single "Hollaback Girl" became the first U.S. digital download to sell one million copies. Stefani's second solo album The Sweet Escape (2006) yielded "Wind It Up", a moderate worldwide success, and "The Sweet Escape". Including her work with No Doubt, Stefani has sold more than 40 million albums worldwide. She won the World's Best-Selling New Female Artist at the World Music Awards 2005.

Stefani is known as a fashion trendsetter. In 2003, she debuted her clothing line L.A.M.B. and expanded her collection with the 2005 Harajuku Lovers line, drawing inspiration from Japanese culture and fashion. Stefani performs and makes public appearances with four back-up dancers known as the Harajuku Girls. She married British grunge musician Gavin Rossdale in 2002 and they have two sons: Kingston James McGregor Rossdale, who was born May 26, 2006, and Zuma Nesta Rock Rossdale, who was born August 20, 2008.