Beatrice of Rethel (1130/35[1] – 30 March 1185) was a French noblewoman and Queen of Sicily as the third wife of Roger II.

[2] Beatrice was born in 1130 or 1135, the eldest daughter and one of the nine children of Guitier of Rethel and Beatrix of Namur.

[4] Beatrice was a little over three weeks pregnant at the time of his death, and their only child, Constance, was born the following November.

[3] Beatrice survived her husband by thirty-one years but there is no record of her having married again.

Her daughter Constance was confined to a monastery as a nun since childhood due a prophecy that "her marriage would destroy the kingdom".