Siam station (Thai: สถานีสยาม, RTGS: Sathani Sayam, pronounced [sā.tʰǎː.nīː sā.jǎːm]) is the cross-platform interchange station for the BTS Skytrain in Pathum Wan district, Bangkok, Thailand. It is the largest and busiest station on the BTS with 40,000–50,000 passengers per day, where passengers on the Sukhumvit and Silom Lines change trains.