Who invented the Big Mac for McDonald's?

Jim Delligatti invented the Big Mac for McDonald's.

Delligatti was a McDonald's franchisee in the Pittsburgh area. He developed the sandwich in 1967 by using two beef patties, a middle bun, cheese, lettuce, pickles, onions, and the signature sauce. The larger sandwich was intended to give customers a more substantial option than McDonald's standard hamburgers.

The Big Mac was first sold at Delligatti's restaurant in Uniontown, Pennsylvania, and then expanded across the McDonald's system. It became one of the company's most important branded menu items and eventually acquired a distinctive visual identity of its own.

The product is sometimes described as a creation of Ray Kroc because Kroc led McDonald's expansion. However, the sandwich itself was developed by franchisee Jim Delligatti, making him the specific inventor associated with the Big Mac.