Inside the basilica there are many radiating chapels located along the aisles and round the apse. Inside the apse there are seven chapels, five more on each aisle and facing the main façade there is the Holy Spirit’s chapel and the baptistery. Entering Saint Mary’s door and from left to right, the apse chapels are the Saint Christ, Mother of God of Montserrat, Saint Mark, Saint Peter (where the organ is), Saint Nicholas, Saint Joseph and the one of the Saera’s family. Almost all of them have altarpieces and altars.
On the left side of the nave, from the portal already mentioned to the back, the following chaples are located: Pilar, Saint Isidre, Saint Honorat, and the Holy Trinity and the Solitude. On the right side of the nave, the following chapels are located: the Holy Spirit, Saint Anthony M.Claret, Lurdes Virgin, the Immaculate and Saint Savior.