Fai Na Saeng (, ) is a tambon (subdistrict) of Lom Sak District, in Phetchabun province, Thailand. In 2026, it had a population of 2,327 people.
History Fai Na Saeng became a tambon on December 25, 1996.
Administration Central administration The tambon is divided into six administrative villages (mubans). No. Name Thai Population1.Tha Suan Monท่าสวนมอญ4422.Fai Na Saengฝายนาแซง3823.Bueng Nueaบึงเหนือ2944.Bueng Klangบึงกลาง2505.Bueng Taiบึงใต้5926.Huai Khokห้วยกอก367
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