Chatuchak weekend market in Bangkok is the largest market in Thailand, and largest of the world. Frequently called J.J., it covers over 35 acres (1.13 km²) and contains upwards of 15,000 stalls. It is estimated that the market receives between 200,000 and 300,000 visitors each day. Most stalls only open on Saturdays and Sundays.

The market offers a wide variety of products including household items, clothing, Thai handicrafts, religious artifacts, collectibles, foods, and live animals.

Chatuchak market is adjacent to the Kamphaengphet station (MRT) of the Bangkok Metro, or about a 5-minute walk from the Mo Chit Skytrain (BTS) station and Suan Chatuchak (Chatuchak Park) station(MRT).