Year 1806 (MDCCCVI) was a common year starting on Wednesday (link will display the full calendar) of the Gregorian calendar and a common year starting on Monday of the 12-day slower Julian calendar.

 Johann Michael Haydn (help·info) (14 September 1737 – 10 August 1806) was an Austrian composer of the classical period, the younger brother of Joseph Haydn.

Johann Michael Haydn was born in 1737 in the Austrian village of Rohrau, Austria near the Hungarian border. His father was Mathias Haydn, a wheelwright who also served as "Marktrichter", an office akin to village mayor. Haydn's mother Maria, née Koller, had previously worked as a cook in the palace of Count Harrach, the presiding aristocrat of Rohrau. Mathias was an enthusiastic folk musician, who during the journeyman period of his career had taught himself to play the harp, and he also made sure that his children learned to sing; for details see Mathias Haydn.

Michael's early professional career path was paved by his older brother Joseph, whose skillful singing had landed him a position as a boy soprano in the St. Stephen's Cathedral, Vienna where he worked as a chorister, under the direction of Georg Reutter. Other singers in that choir included Johann Georg Albrechtsberger and Franz Joseph Aumann, both composers with whom Haydn later traded manuscripts. The early 19th century author Albert Christoph Dies, reporting from Joseph's late-life reminiscences, says the following: