Phra Mahachai Phraisop (Thai: พระมหาไชไพรสภ), also known as Phra Mahachai (Thai: พระมหาไชย) or Phra Phraiprasop (Thai: พระไพรประสบ), is the god of rice or the deity who protects rice according to Thai beliefs[2] and has the same characteristics and duties as Mae Phosop, the goddess of rice.

[3] Phra Mahachai Phraisop appears in the textbook of images of idols (ตำราภาพเทวรูป).

The deity resembles a male holding a mature rice sheaf in one hand and holding a dagger.It is believed that Phra Mahachai Phraisop developed from Mae Phosop, who was originally a female.

[3] Like the Tai Khong (ใต้คง) people in Yunnan, there was a male deity of rice called Pu Khwan Khao (ปู่ขวัญข้าว), which Siraphon Na Thalang assumed that this belief may have been influenced by Chinese patriarchal culture.

[3] There is a painting of Phra Mahachai Phraisop in front of the Chai Chumphon Throne Hall in the Grand Palace.