Benji Madden (born Benjamin Levi Combs on March 11, 1979) is an American record producer, DJ and the guitarist and backup vocalist for the band Good Charlotte, he co-founded with his twin brother, Joel Madden.

Benjamin "Benji" Madden was born in Waldorf, Maryland to a working class Irish-American family. He has an identical twin brother, Joel Madden, who sings lead in the band Good Charlotte. He has an older brother named Josh, who helps design their DCMA Collective clothing line. Madden also has a younger sister, Sarah, who was in a band called Her Daily Obsession. Madden attended La Plata High School in La Plata, Maryland. When he was sixteen years old his father, Roger Combs, left the family causing them financial hardship. Madden took up various odd jobs as a teenager to help with the family's bills. While in his early twenties, Madden changed his last name from Combs, his father's name, to his mother's maiden name, Madden. He did so to distance himself from his father, against whom he holds a strong grudge.

In the 2001 film Not Another Teen Movie, Benji and the other Good Charlotte members made a cameo as the band at the school's prom. Madden made another appearance in the 2006 film Material Girls with his brother Joel.