| Building Name: | San Tommaso Apostolo |
| Native Name: | Chiesa di San Tommaso Apostolo |
| Native Name Lang: | it |
| Map Size: | 220px |
| Location: | Alcamo, Trapani, Italy |
| Coordinates: | 37.9811°N 12.9678°W |
| Religious Affiliation: | Catholic |
| Region: | Sicily |
| State: | Italy |
| Province: | Trapani |
| Territory: | Alcamo |
| Year Completed: | about 1450 |
| Length: | 10.50 m |
| Width: | 5.30 m |
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.[1] It is the only church which has remained integral among those built before the 16th century in Alcamo.
In 1599 the company of the Holy Ghost was founded in this church.
The roof, which had been damaged by rain, was reconstructed by the government and the town council in 1928.
Since 1984 it has been the seat of Alcamo Rotary Club.[2]
The church has little sizes (10,50×5,30 metres). The interior has got a single nave and is divided by a pointed arch leaning on two wall columns; 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. One of the capitals is decorated with acanthus leaves, the other one with wickerwork. 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);[3] it is dominated by a single lancet window, magnificently carved and enriched by two small columns embedded into the wall.[3]
Today the white marble baptistery, realized in the 15th century, is inside the Sacred Art Museum of Basilica of Our Lady of the Assumption.