No. Diet Coke is sugar-free. In 1982, to great fanfare, the company introduced Diet Coke as the first extension of the Coca-Cola trademark, a move that reignited sales. RELATED LINKS Recipe: Diet Coke Chocolate Cake It's a Coke Life: Introducing our Newest Innovation Caffeine and Soft Drinks: Your Questions Answered Is sugar toxic? Is it true that Coca‑Cola started as a medicine?