Thomaskantor is the common name for the musical director of the Thomanerchor, now an internationally known boys' choir founded in Leipzig in 1212. The official historic title of the Thomaskantor in Latin, Cantor et Director Musices, describes the two functions of cantor and director. As the cantor, he prepared the choir for service in four Lutheran churches, Thomaskirche, Nikolaikirche, Neue Kirche and Peterskirche. As director, he organized music for city functions such as town council elections and homages. Functions related to the university took place at the Paulinerkirche. Johann Sebastian Bach was the most famous Thomaskantor, from 1723 to 1750.

The Thomanerchor is a boys' choir in Leipzig, Germany. The choir was founded in 1212. The choir comprises about 90 boys from 9 to 18 years of age. The members, called Thomaner, reside in a boarding school, the Thomasalumnat and attend the St. Thomas School, Leipzig, a Gymnasium school with a linguistic profile and a focus on musical education. The younger members attend the primary school Grundschule Forum Thomanum or Anna-Magdalena-Bach-Schule. Johann Sebastian Bach served as Thomaskantor, director of the choir and church music in Leipzig, from 1723 to 1750.