Siam Square is a shopping and entertainment area in Bangkok, Thailand. The area connects to other important shopping centres, such as Siam Center, MBK Center and Siam Paragon. Siam Square is a very popular shopping area among Thai and foreign visitors. Besides the shopping complex, the area is centrally located and surrounded by hotels, movie theatres, and it is the main junction of sky train.

The central area of Siam Square is an open area named Center Point, which normally hosts activities or special events every weekend.

Within Siam Square itself, there is a wide range of shops and services, including tutor schools, restaurants, cafe, designer clothing boutiques, record stores, bookshops, Hard Rock Cafe and banks. The customers vary from young-aged school and college students to office workers and foreign tourists. It is sometimes referred to as the "Shinjuku of Thailand".