Benjamin Levi "Benji" Madden (born March 11, 1979) is the guitarist and backup vocalist of the band Good Charlotte. He and his brother were born with the last name of Combs. It was their father's last name. They had their name legally changed to Madden which is their mother's maiden name. His twin brother, Joel, is the band's lead vocalist. His father left the family on Christmas Eve when he was 16 years old. Benji was often blamed for Joel's misbehavior because he was known as a troublemaker. Benji and Joel also suffered alienation in school for being fans of punk rock. Benji is 5 minutes older than his brother, Joel. They have an older brother, Josh, who helps run "Made", their clothing brand. The twins also have a younger sister named Sarah. Benji is also nicknamed Kid Vicious after Sid Vicious. He is a vegetarian unlike his brother. Benji also often works with PETA to help support vegetarianism and animal rights. Benji has many piercings and tattoos, some of which are of Jesus Christ and the Virgin Mary from the Bible.

In 2004, Benji was on Punk'd with his brother Joel after they were both tricked by Ashton Kutcher for the incident when they saw Joel's Range Rover had crashed on top of a Volvo while being towed. Also, Benji and Joel hosted a show on MTV called All Things Rock.