San Nicola di Trullas (or Truddas) is a countryside church between the communes of Semestene and Pozzomaggiore, in the province of Sassari, Sardinia, Italy
It belonged to a local influential family and in 1113 it was assigned to Camaldolese monks.
It is a small example of Pisan-Lombardy Romanesque architecture. The interior has cross vaults and several frescoes.