The municipality's parochial church, in the Romanesque style, is dedicated to Sant Martí. It was constructed in the 12th century. It has a single nave with apse. It also has a later, hip-roofed bell tower, and conserves a baroque altar and other neoclassical elements in the interior. The church was completely renovated in 1970.
The municipality has several other extant churches, including the Church of the Santa Creu, and, notably, the Church of Sant Quintí. This barrel-vaulted structure had its 11th century reliquary removed to the Diocesan Museum of Solsona.
Montclar's town festival is celebrated in January, to coincide with the feast day of Saint Sebastian.