Hans-Adam I (Johann Adam Andreas; 16 August 1662 – 16 June 1712) was the son of Karl Eusebius, Prince of Liechtenstein (1611–1684) and Princess Johanna Beatrix of Dietrichstein (1625–1676).

Johann did not take up an office at the Imperial court but did case-by-case work, especially as a financial expert.

He bought works by Rubens[3] and van Dyck for his collections and was one of the most generous patrons of his time.

Johann married his first cousin, Erdmuthe Maria Theresia of Dietrichstein, Princess of Dietrichstein-Nikolsburg (17 April 1652 – 15 March 1737) on 16 February 1681.

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