Lay's (also known as Walkers in the United Kingdom and Ireland, Smith's in Australia, Chipsy in Egypt, Poca in Vietnam, Tapuchips in Israel, Margarita in Colombia, Katkoot in Kuwait and Sabritas in Mexico; formerly known as Hostess in Canada until 1996) is the brand name for a number of potato chip varieties as well as the name of the company that founded the chip brand in 1932. Lay's has been owned by PepsiCo since 1965. Other brands in the Frito-Lay group include Fritos, Doritos, Ruffles, Cheetos, Rold Gold pretzels, Munchos, Funyuns, and Sun Chips.

Lay may refer to:

• Lay Range, a subrange of mountains in British Columbia, Canada
• Lay, Loire, a French commune
• Lay (river), France
• Lay, Iran, a village in Ardabil Province, Iran
• Lay, Kansas, an unincorporated community in the United States, also known as Sycamore