Wotsits is a British brand of cheese flavoured corn puffs sold first by Golden Wonder and now by Walkers Crisps. The most common form is the "Really Cheesy" flavour of corn puffs. Other shapes and flavours have also been sold, including: Wotsits Giants, Wotsits Flaming Hot, Wotsits Sizzling Steak, Wotsits Prawn Cocktail and Wotsits Crunchy. The brand name in the singular ("Wotsit") refers to an individual corn puff. It is an allusion to the slang term "whatsit", a placeholder name, to which it is phonetically identical in British speech.

Walkers Snack Foods Limited, trading as Walkers, is a British snack food manufacturer mainly operating in the UK and Ireland. The company is best known for manufacturing potato crisps and other snack foods. In 2013, it held 56% of the British crisp market. Walkers was founded in 1948 in Leicester, England, by Henry Walker. The Walkers family sold the business in 1970 to American food producer, Standard Brands. In 1989, Walkers was acquired by PepsiCo, owners of US snack brand Frito-Lay.