Frogbit or frog's bit is a common name for several plants in the family Hydrocharitaceae and may refer to:

• Hydrocharis morsus-ranae – European frogbit

• Hydrocharis laevigata – Amazon frogbit, South American frogbit

• Hydrocharis spongia – American frogbit

See also

• Ranunculus hydrocharoides, frog's bit buttercup