Mechthild of Bavaria (12 July 1532 – 2 November 1565 in Baden-Baden) was a German noblewoman. She was the daughter of William IV, Duke of Bavaria and his wife Marie. She was buried in the Stiftskirche at Baden-Baden.

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On 17 January 1557 she married Philibert, Margrave of Baden-Baden, and they had the following children:

• Jakobea (16 January 1558 – 3 September 1597 in Düsseldorf), married Duke John William of Jülich-Cleves-Berg.
• Philip II (19 February 1559 in Baden-Baden – 17 June 1588), Margrave of Baden.
• Anna Maria (22 May 1562 – 25 April 1583 in Třeboň).
• Maria Salome (1 February 1563 – 30 April 1600 in Pfreimd).

Mechthild is a German form of Matilde.^[1]