The Old Cathedral of Lleida is a Romanesque-Gothic cathedral located in the city of Lleida, in the Catalonia region of Spain. It was originally built in the 12th century as a mosque during the Muslim occupation of the region, and later converted into a church after the city was conquered by the Christians in the 13th century.

The cathedral features a mix of architectural styles, reflecting the different historical periods in which it was built and renovated. The original mosque was converted into a church in the 13th century, and the cathedral was expanded over the centuries with the addition of Gothic and Renaissance elements.

One of the most notable features of the cathedral is its 12th-century cloister, which features intricate carvings and sculptures of biblical scenes and other religious figures. The cloister is also home to a small museum that houses a collection of religious artifacts and works of art.

Other notable features of the cathedral include its impressive bell tower, which offers panoramic views of the city, and the Chapel of St. James, which features a beautiful Gothic altarpiece.