Thap Kwang (Thai: ทับกวาง, pronounced [tʰáp kwāːŋ]) is a tambon (subdistrict) of Kaeng Khoi District, Saraburi Province, central Thailand.

It is a residential community of Laotian who migrated from Kingdom of Vientiane since the King Taksin's reign.

Later in the King Chulalongkorn (Rama V)'s reign, during which Prince Damrong Rajanubhab was Minister of the Interior, he was of the opinion that the name might create racial divisions.

[2] Thap Kwang in the Boworadet Rebellion that occurred in October 1933 was a battleground fought between government forces with the militants led by General Prince Boworadet and Colonel Phraya Sri Sitthi Songkhram, especially on the northeastern railway line and 2–3 consecutive railway stations.

Thap Kwang is also crossed by the northeastern line of the State Railway of Thailand (SRT) with two stations: Map Kabao, and Pha Sadet.