Nicola Formichetti, Diesel’s artistic director, has stepped down after five years in the role.
He is due to leave the business at the end of the year, and it is not yet known who will replace him.
Before Diesel Formichetti spent two years at Mugler as creative director.
Renzo Rosso, founder of Diesel, said: “I want to thank Nicola for our collaboration over the past years – they will remain a special moment in the history of our brand.
“He looked at our past, at our iconic pieces, and refreshed them in the brand DNA, reigniting Diesel’s imagery and branding on the values of freedom and originality.”
Formichetti added: “I loved being part of Diesel, starting from its core and its heritage to recreate something newer. I thank Renzo for having given me this opportunity, for sharing my vision and for believing in the power of originality.”