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Street market in Bangkok, Thailand

The Chatuchak Weekend Market (ตลาดนัดจตุจักร, ), on Kamphaeng Phet 2 Road, Chatuchak, Bangkok, is the largest market in Thailand. Also known as JJ Market, it has more than 15,000 stalls and 11,505 vendors (2019), divided into 27 sections. Chatuchak Market sells many different kinds of goods, including plants, antiques, consumer electronics, cosmetics, pets, fresh and dry food and drinks, ceramics, furniture and home accessories, clothing, and books. It is the world's largest and most diverse weekend market, with over 200,000 visitors every weekend.

Chatuchak Market has been open since 1942. In 1948, Prime Minister Plaek Phibunsongkhram had a policy that every province was required to have its own market. Bangkok chose Sanam Luang as the market site. After a few months, the government moved the market to Sanam Chai. The market moved back to Sanam Luang in 1958. Starting in 1975, General Kriangsak Chamanan had the policy of using Sanam Luang as a place of recreational activity for the populace which would also be used for commemorating ceremony. As General Kriangsak Chamanan was the chairman of State Railway of Thailand at that time, he thus permitted the use of land on the south side of Chatuchak Park as a market. His plan was to recycle waste from the looming Din Daeng Garbage Mountain which had stacked up across the decades to use as landfills, and he recruited military engineers for the job. The park was fully completed in 1978, when General Kriangsak Chomanan became the Prime Minister. By 1983, all of the merchants had moved to Chatuchak. At that time the market was called Phahonyothin Market. In 1987, its name was changed to Chatuchak Market. The clock tower is a distinctive landmark in the Chatuchuk Market. It was built in 1987 on the occasion of King Bhumibol Adulyadej's 60th birthday on 5 December 1987, a cooperative effort of the market administration and Thai Chinese Merchant Association.

Monthly stall rent for vendors at the market ranges from 10,600 to 17,700 baht. A University of the Thai Chamber of Commerce (UTCC) study found that most merchants have been selling at the weekend market for four to six years and have an average sales revenue of 139,500 baht per month. In a survey conducted on 28–29 March 2015, researchers counted 1,271 birds of 117 species for sale in 45 shops or stalls. Of the total, nine species were listed as "Threatened" on the IUCN Red List and eight species as "Near Threatened".

The market is served by the Kamphaeng Phet Road and is served by the Kamphaeng Phet (western end) and Chatuchak Park stations (eastern end) on the MRT Blue Line. The eastern end of the market is also served by Mo Chit BTS station on the Sukhumvit Line.