Johann Caspar Bagnato (13 September 1696 – 15 July 1757), also known as Giovanni Gaspare Bagnato, was born in Landau in the Palatinate of the Rhine. He was an architect of the Baroque-period, most active in the southwest of Germany and in northern Switzerland. His father was born in Como, Italy, whereas his mother, Anna Maria Stickelmeyer, was German. His son Franz (Ignaz) Anton Bagnato (1731–1810) also worked as an architect.
In 1729, he was offered the chance to execute a major re-design of the castle in Altshausen. Most of the plans he designed for this castle were, however, never realized.