John Adolph of Nassau-Usingen | |
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| Born | 17 July 1740 Biebrich |
| Died | 10 December 1793 (aged 53) Wiesbaden |
| Noble family | House of Nassau |
| Father | Charles, Prince of Nassau-Usingen |
| Mother | Christine Wilhelmine of Saxe-Eisenach |
John Adolph of Nassau-Usingen (17 July 1740 in Biebrich – 10 December 1793 in Wiesbaden) was Count of Saarbrücken and Saarwerden and Lord of Lahr, Wiesbaden and Idstein. He served as a colonel in the French army and later in the royal Prussian army as Major-General and as chief of the Fusilier Regiment No. 47.