Harlequin toad is a non-scientific name for any of several varieties of frog or toad, including the following:
Atelopus, a genus of Central and South American toads in the family Bufonidae Harlequin poison frog (Oophaga histrionica), a species of South American poison dart toad in the family Dendrobatidae Harlequin tree frog (Rhacophorus pardalis), found in Southeast Asia and belongs to the family Rhacophoridae