Beatritz or Beatriz de Dia (born c. 1140 - flourished circa 1175, Provence) was the most famous of a small group of trobairitz, or female troubadours who wrote courtly songs of love during the twelfth and thirteenth centuries.

She is only known as the Comtessa de Dia ("Countess of Dia") in contemporary documents, but was almost certainly named Beatriz and likely the daughter of Count Isoard II of Dia (a town northeast of Montelimar in southern France). According to her vida, she was married to Guillem or Guilhem de Poitiers, Count of Viennois, but was in love with and sang about Raimbaut of Orange (1146-1173).

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