Designer Giorgio Armani, who helped to put Italy at the forefront of global fashion and dressed Hollywood stars, has died at the age of 91, the company that he founded and led for five decades says.

"With infinite sorrow, the Armani Group announces the passing of its creator, founder and tireless driving force: Giorgio Armani," the fashion house said in a statement.

Armani died at home, the company said.

Armani, who was 91, was synonymous with modern Italian style and elegance.

He dressed celebrities including Cate Blanchett, Julia Roberts, George Clooney, Nicole Kidman, Kevin Costner and Lady Gaga.

He combined the flair of the designer with the acumen of a businessman, running a company that turned over 2.3 billion euros ($A4.1 billion) a year.

Armani also owned several bars, clubs,

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