Trappista (Croatian: Trapist sir) (Serbian: Трапист сир) is a traditional semi-hard cow's-milk cheese made in France, Belgium, Bosnia and Herzegovina and Hungary.

[citation needed] The secret recipe found its way to Bosnia and Herzegovina with the arrival of Cistercian Trappists and establishment of Mariastern Abbey, Banja Luka in 1869.

The monks lent portions of their name, Trapisti, to the entire neighborhood, and left a prominent legacy in the area through the production of both this famous cheese and a beer.

The original French recipe is still manufactured today, under the trademark name of Port-Salut or the common name of Saint-Paulin.

In Hungary, the Trappista cheese is mass produced and this version significantly differs from the original recipe.