The Széchenyi Medicinal Bath in Budapest (IPA: [seːtʃeːɲi], Hungarian: Széchenyi-gyógyfürdő) is the largest medicinal bath in Europe. Its water is supplied by two thermal springs, their temperature is 74 °C (165 °F) and 77 °C (171 °F), respectively.

Components of the thermal water include sulphate, calcium, magnesium, bicarbonate and a significant amount of fluoride acid and metaboric acid. Medical indications are on degenerative joint illnesses, chronic and sub-acute joint inflammations, as well as orthopaedic and traumatological post-treatments.

It can be reached by public transport, metro line 1 (yellow line) from Vörösmarty square.(It is also a station of the yellow M1 (Millennium Underground) line of the Budapest Metro) or the trolleybus 72. From downtown, the bath is a few hundred metres beyond Heroes Square.