Count Johann Adam von Questenberg (baptized 24 February 1678; died 10 May 1752)[1] was an Austrian nobleman, statesman, amateur musician, and patron of the arts.

Questenberg was baptised in Vienna, as the son of Count Johann Anton (1633–1686) and his wife, Baroness Maria Katharina von Stadel (born 1641).

[1] In 1702, after spending three years taking his "Grand Tour" through Europe, he came to the Aulic Council in Vienna, in the capacity of a councilor.

[1] He may have met Bach in Karlsbad, where he had accompanied the court music director, Prince Leopold von Anhalt-Köthen, in 1718 and 1720.

[1] He appointed Dominik Andreas von Kaunitz [de], his second wife's nephew, as heir to his properties and title.