Sapphaya (Thai: สรรพยา, pronounced [sàp.pʰā.jāː]) is the easternmost district (amphoe) of Chai Nat province, central Thailand.

It is said that when Phra Lak (Lakshman) was hit by Kumbhakan (Kumbhakarna)'s powerful spear until he was fatally injured.

Phipek (Vibhishana) had Hanuman fly to search for a magical herb named Sangkorani Trijava (Sanjeevani) comes to cure, this kind of herb only grows on Khao Luang hill.

The folklore is based on the Ramakien literature, a Thai version of Hindu epic Ramayana.

There are another three tambon administrative organizations (TAO) covering the non-municipal areas of the sub-districts Supphaya, Khao Kaeo, and Pho Nang Dam Ok.