Thaen Khwan is a species of water lily, with the botanical name Nymphaea tan khwan and commonly as the Tan-khwan Water Lily. This free-blooming hardy water lily is a hybrid of the Perris Fire Opal and the Sirius.

Its colour is deep pink, while the form of the flower is star-like, with layers of petals, formed by 44 to 48 petals.