The Vienna Boys' Choir (German: Wiener Sängerknaben) is a choir of boy sopranos and altos based in Vienna, Austria. It is one of the best known boys' choirs in the world. The boys are selected mainly from Austria, but also from many other countries.

The choir is a private, non-profit organization. There are approximately 100 choristers between the ages of nine and fourteen. The boys are divided into four touring choirs, named after Austrian composers Bruckner, Haydn, Mozart and Schubert, which combined perform about 300 concerts each year before almost 500,000 people. Each group tours for about nine to eleven weeks. Some pieces include "Good Morning" and "Merry Christmas from Vienna Boys".

The choir is the modern-day descendant of the boys' choirs of the Viennese Court, dating back to the late Middle Ages. The Wiener Hofmusikkapelle was established by a letter from Emperor Maximilian I of the Holy Roman Empire on 30 June 1498, instructing court officials to employ a singing master, two basses and six boys. George Slatkonia became the director of the ensemble. The role of the choir (numbering between 24 and 26) was to provide musical accompaniment for the church mass. Additionally, the Haydn brothers were members of the St. Stephen's Cathedral choir, directed at the time by Georg Reutter II, who used this choir in his duties for the imperial court, which at the time had no boy choristers of its own.

Over the centuries, the choir has worked with many composers, including Heinrich Isaac, Hofhaimer, Biber, Fux, Caldara, Gluck, Salieri, Mozart, Schubert and Bruckner.

In 1920, following the fall of the Austrian Empire, the Hofkapelle (court orchestra) was disbanded. However, the rector at the time, Josef Schnitt, sought a continuation of the tradition. In 1924, the Vienna Boys' Choir was officially founded, and it has evolved into a professional music group. The choir adopted the now-famous blue-and-white sailor suit, replacing the imperial military cadet uniform that included a dagger. The composer HK Gruber is one of the graduates of the reformed choir.

While touring in Australia in 1939, the boys became stranded in Perth when their ship returning them to Austria was seized. Germany had just invaded Poland and Australia had entered the Second World War. The catholic archbishop of Melbourne, Dr Daniel Mannix, organised the boys' foster care as long as they formed a choir at St Patrick's Cathedral in Melbourne. Staying together in Australia saved them from conscription into the German army as they came of age during the war. Only one of the boys returned to Vienna after the war.

Since 1948, Palais Augarten has served as the rehearsal venue and boarding school, which goes from kindergarten level up to middle school level.

In 1961, Walt Disney filmed Almost Angels, a fictional drama about (and starring) the Vienna Boys' Choir, set and filmed in the Palais Augarten. It was Disney who, for cinematographic reasons, persuaded the Austrian government to allow the boys to legally wear the Austrian national emblem on the breast of their uniform, a tradition that continues to this day.