Philippine Welser (1527 – 24 April 1580) was the morganatic wife of Ferdinand II, Archduke of Austria.

She was granted the titles Baroness of Zinnenburg, Margravine of Burgau, Landgravine of Mellenburg and Countess of Oberhohenberg and Niederhohenberg.

She was the niece of the world merchant and banker Bartholomeus V. Welser, although their relationship to one another remains open because of the inadequate sources.

The emperor's son Archduke Ferdinand II of Habsburg, Prince of Tyrol, secretly married the bourgeois Philippine – many royal houses used marriages to merge alliances, and this was also planned for Ferdinand II, a not inconsiderable process.

The first documented contact between Philippine and Ferdinand is at a carnival amusement in Plzeň, when they attended a masked ball (including a spectacular "water ballet") in February 1555.

A year later, on 12 May 1556, Ferdinand can be documented for the first time at Březnice Castle in Bohemia, when Catharina of Lokšany, an aunt of Philippine, received a passport letter for a drive of cattle.

Březnice initially became the residence for Philippine, the scene of the secret wedding and the birth of her first child, which Ferdinand gave her.

When the parents moved from Bohemia to Tyrol, the bodies were secretly taken and buried in the Innsbruck court church.

Her husband ordered that she be given a white marble tomb in the silver chapel of the Innsbruck court church.