Graham Bonnet (born December 23, 1947) is an English rock singer renowned for his powerful vocal range and dynamic stage presence. He began his career in the late 1960s with the duo The Marbles, achieving a UK Top 5 hit with "Only One Woman" in 1968, penned by the Bee Gees.

In 1979, Bonnet joined the hard rock band Rainbow, replacing Ronnie James Dio as lead vocalist. His tenure with Rainbow produced the successful album Down to Earth, featuring hits like "Since You Been Gone" and "All Night Long".

Following his departure from Rainbow, Bonnet released the solo album Line-Up in 1981, which included the UK Top 10 single "Night Games". He then joined the Michael Schenker Group in 1982, contributing to the album Assault Attack.

In 1983, Bonnet co-founded the band Alcatrazz, collaborating with notable guitarists such as Yngwie Malmsteen and Steve Vai. The band released several albums, including No Parole from Rock 'n' Roll and Disturbing the Peace, gaining significant popularity, particularly in Japan.

Throughout his career, Bonnet has also worked with bands like Impellitteri, Blackthorne, and Anthem, and has maintained a solo career. He is recognized for his distinctive style and for his self-taught, robust vocal delivery.

As of 2025, Bonnet continues to perform and record music, remaining an influential figure in the hard rock and heavy metal scenes.