Mazara del Vallo is a town in southwestern Sicily, Italy, which lies mainly on the left bank at the mouth of the Mazaro river, administratively part of the province of Trapani.
It is an agricultural and fishing centre and its port gives shelter to the largest fishing fleet in Italy.

Mazara made national news in March 1998, when a bronze statue called the Dancing Satyr (Satiro Danzante) was found off the port, at a depth of 500 meters in the Strait of Sicily by a local fishing boat. The statue is believed to have been sculpted by Greek artist Praxiteles and is now on display to the public in a dedicated museum in the city, after having been on show at the Chamber of Deputies of Rome, and in Aichi, Japan. After this event, the city quickly gained in terms of visiting tourists and a national advertising campaign was mounted with the slogan Mazara del Satiro.
Other attractions include the Norman Arc, that is the remains of the old Norman Castle built in 1073 and demolished in 1880, and a number of churches, including the Royal Saint Nicholas (San Nicolò Regale) Church, a rare example of Norman architecture built in 1124, the Seminary, built in 1710, which surrounds the main local piazza, Piazza della Repubblica, and St. Vitus on the Sea (San Vito a Mare) Church. In honour of St. Vitus, the official patronal saint as well as a native of Mazara del Vallo, the St. Vitus Feast (Lu Fistinu di Santu Vitu) is held every year.