Saint Louis Station (BTS Code: S4) is an elevated station on the BTS Skytrain's Silom Line, located above the Sathorn Canal on North and South Sathorn Roads, within the Bang Rak and Sathorn districts of Bangkok. This station serves as another key point in the heart of the Sathorn business area and was opened to the public on February 8, 2021. It is notable for being the first additional BTS station in Thailand to be constructed along an existing operational line. Originally, Saint Louis Station was designated as a future station without any prior construction, but it had been assigned a station code for fare calculation purposes for 21 years.