Wayfair Inc. is an American multinational e-commerce company based in Boston, Massachusetts that sells furniture and home goods online. Formerly known as CSN Stores, it was founded in 2002, and currently offers 14 million items from more than 11,000 global suppliers. The company maintains international operations, including locations in North America and in Canada, Ireland, China and the United Kingdom.

Wayfair operates five branded retail websites: the main Wayfair site, Joss & Main, AllModern, Birch Lane, and Perigold.

Entrepreneurs Niraj Shah and Steve Conine founded Wayfair in August 2002 as a two-person company with a makeshift headquarters in Conine's nursery in Boston, Massachusetts. Both Shah and Conine hold a Bachelor of Science degree from Cornell University, and had run two previous companies: Simplify Mobile, and iXL, a global consulting firm.

As of December 2018^[update], Shah is the chief executive officer, and Shah and Conine share the chairman position.

Originally known as CSN Stores (derived from a combination of Shah and Conine's initials), the company began with the website racksandstands.com, selling media stands and storage furniture.

In 2003, it added patio and garden goods suppliers, three online stores, and more than a dozen employees, and moved its headquarters to an office on Newbury Street in Boston.

Over the next two years, it expanded its catalog to include home décor; office, institutional, and kitchen and dining furniture and materials; home improvement goods; bed and bath materials; luggage and lighting. In 2006, it had $100 million in sales.

The company expanded in the United States and into international markets.