The Lightning and the Sun is a 1958 book by Savitri Devi Mukherji, in which the author outlines her philosophy of history along with her critique of the modern world. The book is known for the author's claim that Adolf Hitler was an avatar of the Hindu God Vishnu. It was the first book to espouse esoteric Nazism.

Savitri Devi Mukherji was a French-born Greek fascist, Nazi sympathizer, and spy who served the Axis powers by committing acts of espionage against the Allied forces in India. She was later a leading member of the Neo-Nazi underground during the 1960s.