The church has stained glass on various windows and openings. The ones done by the stained glass maker Joan Vila-Grau since 1999 are outstanding; they are made of panes of different colours fixed with lead and concrete. In these pieces of stained glass, Vila-Grau symbolises specific themes through the masses of colour.
The first stained glass windows to be placed were in the transepts, and they express the symbology conceived by Gaudí. The main window of the transept of the Passion façade represents the resurrection, the stained glass of the sides and the main nave will symbolise the saints and shrines linked to the local church represented on each column.