Castello Cova ("Cova Castle"), also known as Palazzo Viviani Cova ("Viviani-Cova Palace") is a landmark Neo-Gothic style residential and business building located on Via Giosuè Carducci #36, in central Milan, region of Lombardy, Italy.

It is located some 100 meters west of the Basilica of Sant'Ambrogio.

Adolfo's career is also noted for designing the Casa del Fascio in Signa, and he was never shy to indulge in the appropriation of former styles and symbols; this building notable for its height and accumulation of Gothic architecture motifs such as a merlionated tower, peaked and rusticated ground-floor arches, and mullion-windows.

It sports numerous decorated balconies on the facade.

[3] The Pusterla di Sant'Ambrogio, an ancient postern of the Medieval walls of Milan facing Castello Cova, was recreated in the late 1930s in a style that matches the Revival style of the Castello.