According to various sources, the most sour candy in the world is Toxic Waste Hazardously Sour Candy. It is a small, hard candy that delivers an incredibly potent and long-lasting sour experience, with the highest sour intensity, duration, and coating on the list. Other extremely sour candies that are also highly ranked include Barnetts Mega Sour Fizz Bombs, Warheads, Sour Skittles, Cry Baby Gum, and Nobel Super Lemon Candy. However, Toxic Waste is consistently ranked as the most sour candy in the world.