The brand is taking on the former Wonderland site on Soho's Brewer Street, which closed earlier this year following the withdrawal of investment.
Junk Group launched in 2013 and operates three restaurants in Paris as well as in Lille, Bordeaux, Strasbourg, Lyon, and Neuilly.
Its menu features burgers in a brioche bread bun and what it describes as a ‘unique secret sauce’ with customisable burgers that range in size from small to XXL.
The brand is known for its crispy patties made from French meat, with options that include large, that comprises three smash patties, XL, made with four patties, and XXL, that comes with five patties.
Also on the menu is a truffle double cheeseburger of two smashed beef patties, American cheese, house fried onions and homemade truffle sauce, and sides such as panko chicken bites and French fries.
Junk also plans to open further restaurants in France in Toulouse, Nice, and Nantes.
It is one of a number of new players to enter the London smash burger scene in the past few months, joining the likes of Supra Burger, which recently took up residency at the Cocotte site in Queens Park in north west London, and SMSH BN on Charing Cross Road.