Isabelle de Meulan, Dame de Mayenne, Dame de Craon (c. 1148 – 10 May 1220) was a French noblewoman, being the daughter of Waleran de Beaumont, 1st Earl of Worcester, Count of Meulan. Isabelle married twice; firstly to Geoffroy, Seigneur de Mayenne, and secondly to Maurice II, Sire de Craon. Her eldest son was a celebrated Crusader.