Nam Tok Sai Yok Noi (Thai: น้ำตกไทรโยคน้อย, lit.

'small Sai Yok waterfall') is a small town (thesaban tambon) in Sai Yok District, Kanchanaburi Province, Thailand, along the route of the Death Railway linking Thailand with Burma.

During World War II, the small town was known as Tarsoa or Tarsau.

As of 2012[update], the town had a population of 3,675,[1] and covered an area of 4.4 km2 of subdistrict (tambon) Tha Sao.

[7] Hellfire Pass is located 27 kilometres (17 mi) from Nam Tok.