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Siam Center | |
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| Location | Rama I Road, Pathum Wan, Bangkok, Thailand |
|---|---|
| Coordinates | 13°44′47″N 100°31′57″E / 13.74639°N 100.53250°E |
| Opened | 29 January 1973 (Siam Center) |
| Developer | Siam Piwat |
| Management | Siam Piwat |
| Owner | Siam Piwat |
| Stores | 400 (Siam Center and Discovery combined) |
| Floors | 4 (Siam Center), 11 (Siam Carpark), 36 (Siam Discovery and Tower) |
| Parking | 1,500 |
Public transit | Siam station |
| Website | www |

Siam Center (Thai: สยามเซ็นเตอร์) is a shopping center near Siam BTS station in Bangkok, Thailand.
Siam Center was built in 29 January 1973 as one of Bangkok's first shopping malls. It has undergone renovation several times, including after a fire in 1997. On 11 January 2013, Siam Center re-branded itself as Siam Center The Ideaopolis.

Siam Discovery (Thai: สยามดิสคัฟเวอรี) is a shopping center located in the same complex as Siam Center. It is adjacent to Siam Center and was completed in 1997. The mall underwent a large scale refurbishment in 2016 designed by Nendo.