Philip II, Count of Nassau-Weilburg (14 March 1418 – 19 March 1492 in Mainz) was Count of Nassau in Weilburg and shared briefly the regency of the County of Saarbrücken.

In 1429, he succeeded his father as count of Nassau-Weilburg, jointly with his brother Johann II ("John").

In 1442, the brothers decide to divide the counties: Johann II received Saarbrücken with Seigneurie of Commercy Château bas (this Nassau-Saarbrücken line died out in 1574) and Philip II received Weilburg (this Nassau-Weilburg line died out in the male line in 1912; however, it was continued in the female line to this day).

Ownership of the possessions in the Palatinate (Dannenfels, Stauf, Kirchhein, Altenbamberg, Wöllstein) would be shared between the two lines.

Philip and Margaret had two sons: As a widower, he married Veronika of Sayn-Wittgenstein.