The cathedral has 23 bells.
The largest is officially named for St. Mary, but usually called Pummerin ("Boomer") and hangs in the north tower. At 20,130 kilograms (44,380 pounds), it is the largest in Austria and the second largest swinging bell in Europe (after the 23,500-kilogram (51,800-pound) Peter in Cologne Cathedral). Originally cast in 1711 from cannons captured from the Muslim invaders, it was recast (partly from its original metal) in 1951 after crashing onto the floor when its wooden cradle burned during the 1945 fire. The new bell has a diameter of 3.14 meters (9.6 feet) and was a gift from the province of Upper Austria. It sounds on only a few special occasions each year, including the arrival of the new year. There are three other bells hanging in this tower, but they are older and no longer used.
A peal of eleven electrically operated bells, cast in 1960, hangs in the soaring south tower. Replacements for other ancient bells also lost in the 1945 fire, they are used during Masses at the cathedral: four are used for an ordinary Mass; the quantity increases to as many as ten for a major holiday Mass; and the eleventh and largest is added when the Cardinal Archbishop of Vienna himself is present. From the largest to the smallest, they are named the St. Stephen (5,700 kg); St. Leopold (2,300 kg); St. Christopher (1,350 kg); St. Leonhard (950 kg); St. Josef (700 kg); St. Peter Canisius (400 kg); St. Pius X (280 kg); All Saints (200 kg); St. Clement Maria Hofbauer (120 kg); St. Michael (60 kg); and St. Tarsicius (35 kg). Also in this tallest tower are the Primglocke (recast in 1772) and the Uhrschälle (cast in 1449), which mark the passing of the hours.
The north Roman tower contains six bells, five of which were cast in 1772, that ring for evening prayers and toll for funerals. They are working bells of the cathedral and their names usually recall their original uses: Feuerin ("fire alarm" but now used as a call to evening prayers) cast in 1859; Kantnerin (calling the cantors (musicians) to Mass); Feringerin (used for High Mass on Sundays); Bieringerin ("beer ringer" for last call at taverns); Poor Souls (the funeral bell); and Churpötsch (donated by the local curia in honor of the Maria Pötsch icon in the cathedral).
The 1945 fire destroyed the bells that hung in the south Roman tower.
It is said that the composer Ludwig van Beethoven discovered the totality of his deafness when he saw birds flying out of the bell tower as a result of the bells' tolling but couldn't hear the bells.
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