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'''Nuphar''' is genus of aquatic plants in the family Nymphaeaceae, with a temperate Northern Hemisphere distribution. The common name, shared with some other genera in the same family, is 'water lily' or 'waterlily'.

There are between 1-25 species in the genus; some botanists treat the genus as just a single variable species (for which the name ''N. lutea'' has priority), but 10-15 species are typically accepted by most authorities.
The genus is closely related to ''Nymphaea'', differing in the petals being much smaller than the 4-6 bright yellow-coloured sepals, whereas in ''Nymphaea'', the petals are much larger than the sepals. The fruit maturation also differs, with ''Nuphar'' fruit being held above water level to maturity, whereas ''Nymphaea'' fruit sink below the water level immediately after the flower closes. Both genera share leaves with a radial notch from the circumference to the petiole (leaf stem) in the center.