XCL American School of Bangkok, Sukhumvit

The American School of Bangkok first opened on Sukhumvit Road in 1983. In 2022 its Sukhumvit campus joined XCL Education, a Southeast Asian school group, and was renamed XCL American School of Bangkok (XCL ASB). The campus is on Sukhumvit Soi 49/3 in Khlong Tan Nuea, Watthana, a residential area between Phrom Phong and Thong Lo. The original group's Green Valley campus near Bang Na is now run separately.

XCL ASB teaches an American curriculum aligned with the Common Core and the Next Generation Science Standards, from Pre-Kindergarten through Grade 12, and uses project-based learning. High school students can choose from more than 20 Advanced Placement courses, and the school is an authorised AP Capstone provider. Students come from more than 40 countries. The school is licensed by the Thai Ministry of Education and accredited by WASC.

Facilities include classrooms for each school section, an early years centre, a library, science and computer labs, design and technology spaces, music, dance, art and drama studios, a gymnasium, a swimming pool, a football field and a sports complex. Annual tuition is about THB 453,450 for the youngest Pre-K classes, THB 648,860 for Grades 1 to 5, THB 737,340 for Grades 6 to 8 and THB 808,630 for Grades 9 to 12. Fees include books, lunch, snacks and local trips. One-time costs include a THB 150,000 registration fee and a campus development fund.