HOCHST, town of Germany, in the Prussian province of Hesse-Nassau on the Main, 6 m. by rail W. of Frankfort-on-Main. Pop. (1925) Hochst belonged formerly to the electors of Mainz who had a palace here ; this was destroyed in 1634 with the exception of one fine tower which still remains. It has large dye-works and manufactures of machinery, armour, chemicals, furniture and leather. Brewing is carried on and there is a con siderable river trade. The Roman Catholic church of St. Justinus is a fine basilica originally built in the 9th century.
Hochst is also the name of a small town in Hesse. This has some manufactures, and was formerly the seat of a Benedictine monastery.