Costigliole d'Asti (Piedmontese: Costiòle d'Ast) is a small Italian town in the Province of Asti, southern Piedmont.

It lies about 13 kilometres (8 miles) south of the city of Asti in the Alto Monferrato, on the edge of the Langhe, in the alluvial plain of the river Tanaro southwards into the hills.

The neighbouring communes are Agliano Terme, Antignano, Calosso, Castagnole delle Lanze, Isola d'Asti, Montegrosso d'Asti, and San Martino Alfieri (in the Province of Asti); and Castiglione Tinella and Govone (in the Province of Cuneo).

Its vineyards, which cover an area of more than 11.75 square kilometres (4.54 sq mi), are the most extensive of any Piedmontese commune.

[4][5] The main grape varieties grown are Barbera, Dolcetto, Grignolino, Freisa and Brachetto.