Amanita regalis, commonly known as the royal fly agaric or the king of Sweden Amanita, is a species of fungus in the Amanitaceae family. Common in Scandinavian countries, it is also found in eastern and northern Europe. In North America, its distribution is restricted to Alaska. The fruit bodies of the fungus somewhat resemble the fly Agaric (Amanita muscaria), and it was formerly regarded as a variety of this species. A. regalis differs from it in being larger, with a liver-brown cap bearing numerous scabs, and in having a stem which is yellow-ochre at the base, with patches or rings of patches. Chemical analysis has shown that this species contains ibotenic acid and muscimol, the same toxic components found in A. muscaria, but no muscarine or tryptamine derivatives have been found.

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