The town's name derives from the Latin word "cretaceum" (chalky, with reference to the particular soil composition of the lands). It is a hilly town in the province of Vicenza, which is characterized by a main urban core, surrounded by a number of smaller clusters and scattered houses.
The area was colonized by the Romans, who built some important roads, including the Via Postumia, which linked Aquileia to Verona, ordered by the console Postumio Albino in the II century B.C. The lands were reclaimed from the marshlands and divided into centuries (farms assigned to the valorous centurions of the Roman legions). At its foundation, Creazzo submitted the domain of the Municipium of Vicenza. After the fall of the Empire and the consequent lack of order, control and protection, the lands were frequent subject to the raids of the Barbarians. The local inhabitants, threatened by the incursions of the Hungarians, gradually moved to higher locations, in order to live in a more comfortable and safe way. Around year 1000, the Bishop of Vicenza, linked for a long period to Creazzo, had a fortress built. During the XII century the town was destroyed and in the XVI it was invaded by Spanish and German troops at war with the Serenissima Republic of Venice. This period of decline was followed by a period of development, created by a situation of greater stability.

Attractions:
- the Church of Sant'Ulderico, originally built around the year 1000, rebuilt in the first half of the XIX century and enlarged at the beginning of the XX century. Inside it preserves an altarpiece painted in the late XVI century, whose authors are uncertain, probably Francesco and Girolamo Da Ponte;
- the Parish Church of St. Nicholas, situated in the village of Olmo, was built in the XIII century in Romanesque-Gothic style. The building is flanked by a brick bell tower with a spire top;
- the XVIII century Villa Pegoraro, which is preceded by an imposing colonnade;
- Villa Fadinelli-Suppiej, built by the Scamozzi in 1790, features a central gable. It is embellished with frescoed ceilings in neo-Classical style and is surrounded by gardens and a park;
- the late Gothic. Villa Valmarana;
- the XVIII century Villa Farinon-Garagnin-Legranzi;
- Villa Scola-Camerini.