Philip I, Count of Nassau-Wiesbaden-Idstein (1490 in Cologne – 16 June 1558) was member of the House of Nassau who ruled the County of Nassau-Wiesbaden-Idstein.

[1] He was born as the only son of Count Adolph III and his wife, Countess Margaret of Hanau-Lichtenberg.

After his father died in 1511, he became the ruler in his own right.

In 1514, he married Adriana of Glymes, the daughter of John III of Bergen op Zoom.

This article about a member of the German nobility is a stub.