Judith (c. 844 - 870), also called Judith Martel, was the wife of Ethelwulf of Wessex and Ethelbald of Wessex.

Judith was born probably in October of 844, the daughter of Charles the Bald, king of the Franks, and Ermentrude. She was forced by her father to marry Æthelwulf, King of Wessex on October 1, 856 at Verberie sur Oise, France; when he was 51, and she was 13.

After Æthelwulf's death on January 13, 858, she was married to his son, Æethelbald, sometime after Feburary 858. Æethelbald was 18 and she was then 14. After Æethelbald's death, the marriage was annulled (in 860), and she was confined at Senlis.

She eloped with Baldwin I, Count of Flanders, in January 862. He was 23, she was 19. They were probably married at the monastary of Senlis before they eloped. They hid until October, when they went to Lothair for protection. From there they fled to Pope Nicholas for protection. They were then officially married at Auxerre.

They had a son, Baldwin II, Count of Flanders, born in 864. Oddly enough, he was also called the Bald.

Judith died in 870.