Almoster (Catalan pronunciation: [əlmusˈte]) is a village in the province of Tarragona and autonomous community of Catalonia, Spain.

The most mountainous part of the township has a continental Mediterranean climate and more rain as there is a small thermal contrast with the more southerly and lower elevation.

In 1164, in the record population of La Selva del Campo the town of Mosterio mentioned.

The Carrasclet guerrilla group acted with force in the area, assaulting and killing numerous Castilian troops.

Traditionally it used, oval and red stamp showing an inscription and a gold cross and a confusing picture at the bottom.

One of the objects that were lost was the altar dedicated to St. Peter, the work of sculptor Balthasar Bonifaç.

Almoster celebrates its main festival on 30 July, the day of Saints Abdon and Senen.