Indrid Cold (also known as the Grinning Man) is a mysterious legendary being believed to be connected to the Mothman, first encountered by Woodrow Derenberger, as reported in the John Keel nonfiction book The Mothman Prophecies. He is described as being a humanoid entity, allegedly extraterrestrial in origin, with an inhumanly large smile on his face.

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Indrid Cold appears as a character in The Mothman Prophecies, a film based on John Keel's book. He has also been depicted as a character in other works of fiction, such as the podcast The Adventure Zone, the video game Fallout 76, and in the trading card game MetaZoo.