Janusz of Masovia might refer to these dukes:
- Janusz I of Warsaw (ca. 1347/1352 – 1429), son of Siemowit III
- Janusz II of Masovia (1455–1495), son of Bolesław IV
- Janusz III of Masovia (1502–1526), son of Konrad III Rudy, last male of the Masovian Piast dynasty
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