Macron have a number of clubs who use their brand as an official sportswear. The clubs which use Macron's glossy leisurewear are: Bologna, Cagliari, Boavista, Sporting Braga and fellow English counterparts Leeds United.
United's Chief Executive Jason Rockett said: "We are delighted to be working with Macron, a forward thinking company which places great importance on design and quality. They are well established in mainland Europe and clearly intend to be a force in the UK.
"Financially this is an excellent deal for United and is the successful outcome of long-term negotiations. The partnership with Macron is in line with our continued strategy of driving our off-the-field revenue streams."
Macron's Chief Executive Officer Gianluca Pavanello commented: "Macron is delighted to be working with Sheffield United one of the best known names in English football and from the city which gave birth to the game.
"We were impressed by the club's commitment to developing grassroots football and community initiatives, which mirror our own company beliefs. The opportunity to further our brand in line with Sheffield United's international partners in China, Australia and Hungary is also very exciting."