The celebrity hairstylist, who was credited with creating the 'Bauhaus-inspired' hair style, also called the bob, passed away at his Los Angeles home today (May 9).
Police were called to the property at 4.30am GMT when they discovered the fashion pioneer dead, Los Angeles police confirmed.
"It was of apparent natural causes and there is no crime scene," Los Angeles police spokesman Kevin Maiberger said in a statement. "When the officers arrived there were family members at the residence."
Sassoon was known for almost single-handedly ending the 1950s bouffant hairstyles thanks to his revolutionary sharp techniques.
His work included the geometric perm and the low-maintenance "Nancy Kwan" hairstyles, and his innovative cuts were wanted by many celebrities and 'it' stars during the 1960s.
He was responsible for Mia Farrow's haircut in 1968's Rosemary's Baby, which included her line: "It's a Vidal Sassoon, it's terribly in."
Sassoon later built up an empire of salons and hair and skin products, which used the tagline: "If you don't look good, we don't look good."
Born in Hammersmith in 1928, he was awarded a Commander of the Order of the British Empire (CBE) in the 2009 Birthday Honours.
He was married four times and had been suffering from leukaemia in the past year.
A documentary about his life and works, Vidal Sassoon: The Movie, was released in 2010. It used the tagline: "[He was] a rock star, an artist, [and] a craftsman who changed the world with a pair of scissors."
Watch the trailer for Vidal Sassoon: The Movie below: