Thamos, King of Egypt (or King Thamos; in German, Thamos, König in Ägypten) is a play by Tobias Philipp, baron von Gebler, for which, between 1773 and 1780, Wolfgang Amadeus Mozart wrote incidental music, K. 345/336a, of an operatic character.
It is not known for certain whether the music that Mozart composed was performed with the play during his lifetime. The play's première took place at the Kärntnertortheater in Vienna, probably on 4 April 1774, by which time two choruses had been written. Performances in Salzburg in 1776 and 1779-80 may have incorporated the orchestral interludes and the three choruses in their final form, respectively. The music was re-used in 1783 in a different play (set in India, not Egypt), Lanassa, by Karl Martin Plümicke.
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