The organs are from the second half of the 17th century - they were completed in 1693. In 1903-1905 they were rebuilt in a romantic style, and in 1965-1968 there were attempts to restore their Baroque sound. Rich wood carved decoration of the organs was made by the monks. Leżajsk organs are three separate instruments: in the aisles there are smaller instruments, and in the nave the biggest instrument. The main organs are 15 metres high and 7.5 metres wide - prospectus architectural design combines them with two adjacent instruments in the aisles, creating a monumental band organ, on which - the only one in the world - three organists can play simultaneously.

The organs have 75 voices. They are equipped with additional devices such as: cuckoo, drum (tympanum), birds and horribile. They also have a full voice 32'- this means that the largest pipe is more than 10 m long. 4 cabinets of the main organs, connected with the decoration of the choir, make up a monumental façade that fills the west wall of the basilica to the vault.