San Tommaso Apostolo ("Saint Thomas the Apostle") is a former Catholic church located in Alcamo, in province of Trapani, Sicily, southern Italy.

The church, dedicated to Saint Thomas the Apostle, was probably built by the Marcanzas' ancestors at about 1450.

[4] The interior has got a single nave and is divided by a pointed arch leaning on two wall columns;[5] the ceiling is covered by two pointed cross vaults, with prominent shaped ribs and keystones, which are interrupted by capitals as high as the vault and continuing to the floor, where there is a common base with one of the columns bearing the arch.

The pointed external portal (known also as "Saint Thomas' portal") is richly engraved and combines the Hohenstaufen-style module of the arch with the Chiaramontan intaglios );[5] it is dominated by a single lancet window, magnificently carved and enriched by two small columns embedded into the wall.

[5] Today the white marble baptistery, realized in the 15th century, is inside the Sacred Art Museum of Basilica of Our Lady of the Assumption.