Bittern is a classification of wading birds in the heron family.
Bittern may also refer to:
Places Bittern, Victoria, a town in Australia Bittern railway station, on the Stony Point line Bittern Lake, a village in Alberta, Canada Bittern Line a railway in Norfolk, England
Vehicles LNER Class A4 4464 Bittern, a preserved British steam locomotive Boulton Paul Bittern, a British fighter aircraft design of the 1920s HMS Bittern, the name of seven ships of the Royal Navy USS Bittern, several ships in the United States Navy Bittern-class sloop a three-ship class of long-range escort vessels used in the Second World War by the Royal Navy
Other Bittern (salt), a waste product of solar salt operations rich in magnesium sulfate Operation Bittern, a British military operation in World War II
See also Bitterne, a suburb of Southampton, England Bitter (disambiguation)