The Bangsaen21 Half Marathon is an annual half marathon held in Bang Saen, Chonburi Province, Thailand.

It is an IAAF Bronze Label race.

[1] It is currently the only half marathon in Thailand with the IAAF Bronze Label.

[2] The race is organized by MICE & Communication, a Bangkok-based event management company.

[3] Key: Course record This article about marathons or long-distance running is a stub.