Kasten-brust armour (German: Kastenbrust — "box-shaped breast") — is a German form of plate armour from the first half of 15th century.
It was widely used in the Holy Roman Empire before gothic armour was invented. It has a simple but reliable construction: a grand-bascinet helm, box-shaped cuirass, firm gauntlets, and long skirt. Unfortunately only one of such armours has survived till today, and this armour (made approximately at 1440) now could be seen in Rathaus Museum of Vienna. However, this armour is widely represented by paintings and statues of the first half of the 15th century.