Philip I, Count of Nassau-Wiesbaden-Idstein (1490 in Cologne – 16 June 1558) was the only son of Count Adolph III and his wife Margaret of Hanau-Lichtenberg.
After his father died in 1511, he ruled Nassau-Wiesbaden and Nassau-Idstein.
In 1514, he married Adriana of Glymes, the daughter of John III of Bergen op Zoom.
They had five children:
Catherine (1515-1540), married in 1538 to John II of Hohenfels
Philip II (1516-1566)
Margaret (1517-1596)
Adolph (1518-1556), married in 1543 to Françoise, the daughter of Charles I, Count of Ligny
Balthasar (1520-1568)