Vatican's 85-year-old chief exorcist Gabriel Amorth also warned of Satanic influences in the Harry Potter books, The Sun reported.
The priest, who has carried out over 70,000 exorcisms in 25 years, said: "Both seem innocuous but they deal with magic and that leads to evil."
"Yoga is the devil's work. You think you are doing it to stretch your mind and body. But it leads to oriental religions based on the false belief of reincarnation," he said.
"In Harry Potter, the devil uses his powers of magic and evil," Amorth said at a conference in Terni, Italy.
The Italian Yoga Association termed his claims "outrageous". "Yoga is not a religion but a spiritual discipline," it said.