Heinrich XLII (German: Heinrich XLII Fürst Reuß zu Schleiz und Gera; 27 February 1752 – 17 April 1818) was a German prince of the House of Reuss.
He succeeded as Count of Reuss-Schleiz on 25 June 1784, and also to Reuss-Gera on 26 April 1802, when the counties were united as Reuss-Schleiz und Gera.
On 9 April 1806, the united county was raised to a principality.
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