A. sieboldii

A. sieboldii may refer to:
 * Anotogaster sieboldii, the oniyanma, the largest dragonfly species native to Japan
 * Amphiesma sieboldii, the Sikkim keelback, a grass snake species found in South Asia

Synonyms

 * Aralia sieboldii, a synonym for Fatsia japonica, the fatsi or Japanese aralia, a plant species native to southern Japan