E lisabeth DeLuca is an American billionaire who is the widow of Fred DeLuca, the co-founder of the Subway sandwich chain, the world's largest restaurant franchise by store count. Fred DeLuca started the business in 1965 with a $1,000 loan from his family friend, Peter Buck, and built it into a global fast-food giant.

Upon her husband's death in 2015, Elisabeth DeLuca inherited his 50% stake in the company. For many years, she maintained her ownership as a passive investor while the company was run by a professional management team. In 2023, the two founding families agreed to sell Subway to the private equity firm Roark Capital in a deal reportedly valued at over $9 billion. This massive transaction crystalized the DeLuca family's immense fortune. She is also a major philanthropist through the Frederick A. DeLuca Foundation.