Billie Joe Armstrong (born February 17, 1972) is an American singer, songwriter, musician, record producer, and actor. Armstrong serves as the lead vocalist, primary songwriter, and lead guitarist of the punk rock band Green Day, co-founded with Mike Dirnt. He is also a guitarist and vocalist for the punk rock band Pinhead Gunpowder, and provides lead vocals for Green Day's side projects Foxboro Hot Tubs, The Network, The Longshot and The Coverups.

Raised in Rodeo, California, Armstrong developed an interest in music at a young age, and recorded his first song at the age of five. He met Mike Dirnt while attending elementary school, and the two instantly bonded over their mutual interest in music, forming the band Sweet Children when the two were 14 years old. The band changed its name to Green Day, and would later achieve commercial success. Armstrong has also pursued musical projects outside of Green Day's work, including numerous collaborations with other musicians.

In 1997, to coincide with the release of Nimrod, Armstrong founded Adeline Records in Oakland to help support other bands releasing music, and signed bands such as The Frustrators, AFI and Dillinger Four. The record company later came under the management of Pat Magnarella and finally shut down in August 2017.

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