Phi Fa (Thai: ผีฟ้า, Lao: ຜີຟ້າ) is a deity or spirit in the local folklore of Thailand and Laos. It is also known as Phi Thaen (Thai: ผีแถน, Lao: ຜີແຖນ). They play a prominent role in the Phra Lak Phra Lam and the stories of Khun Borom.