Rattail orchid is a term referring to several more or less closely related orchid species, which have inflorescences or aerial roots resembling a rat's tail in shape. It can refer to:
Dendrobium mortii (Pencil orchid) Dendrobium racemosum Dendrobium striolatum (Streaked rock orchid) Dendrobium tenuissimum Dockrillia teretifolia (Bridal-veil orchid) Oncidium cebolleta Paraphalaenopsis labukensis