Johann David Heinichen (April 17, 1683 - July 16, 1729) was a German Baroque composer and music theorist who brought the musical genius of Venice to the court of Augustus the Strong in Dresden. Although Heinichen's music is original, rhythmically exuberant and imaginative, it was inexplicably little known for a long time.

Johann David Heinichen was born in the small village of Crössuln, near Weissenfels. His father Michael Heinichen had studied music at the celebrated Thomasschule Leipzig associated with the Thomaskirche, served as cantor in Pegau and was pastor of the village church in Crössuln. Johann David also attended Thomasschule Leipzig. There he studied music with Johann Schelle and later received organ and harpsichord lessons with Johann Kuhnau. The future-composer Christoph Graupner was also a student of Kuhnau at the time.

Heinichen enrolled in 1702 to study law at the University of Leipzig and in 1705-6 qualified as a lawyer (in the early 18th century the law was a favored route for composers; Kuhnau, Graupner and Telemann were also lawyers). Heinichen practiced law in Weissenfels until 1709.

However, Heinichen maintained his interest in music and was concurrently composing operas. In 1710, he published the first edition of his major treatise on the thoroughbass. He went to Italy and spent seven formative years there, mostly in Venice.

In 1717, Heinichen became a colleague of Johann Sebastian Bach at the court of Prince Leopold of Anhalt-Cöthen, then went on to be Kapellmeister to the Elector of Saxony. His pupils included Johann Georg Pisendel. In 1721, Heinichen married in Weissenfels and the birth of his only child is recorded in January 1723. In his final years Heinichen's health suffered greatly and on the afternoon of 16th July 1729, he was buried in the Johannes cemetery after finally succumbing to tuberculosis.

His music is enjoying a resurgence of popularity, with some of his masses and his final work, a Magnificat, now receiving some attention in the recording world.