Matilda I of Bolougne (1105 - May 3, 1152), also nicknamed Maud, was queen consort of England, the wife of King Stephen. She was also sovereign Countess of Boulogne.

She was born in Boulogne, France. She was the daughter of Eustace III, Count of Boulogne and his wife Princess Mary of Scotland, herself the daughter of King Malcolm III of Scotland and Saint Margaret of Scotland. Matilda married, in 1119, Stephen, Count of Mortain, later King of England, and proved his strongest supporter during the period of civil war known as the Anarchy. Stephen and Matilda had three sons:

• Eustace IV of Boulogne
• Baldwin (d. before 1135)
• William of Blois, Count of Mortain and Boulogne and Earl of Surrey or Warenne .

They also had two daughters, Matilda and Marie of Boulogne.

In ca. 1125, her father died and she succeeded as Countess of Boulogne. She ruled this area jointly with her husband until 1150, when she reigned alone until 1151, when the County was given to her son Eustace, then her other son William inherited it, then her daughter Marie.

Queen Matilda died at Hedingham Castle, Essex, England and is buried at Faverhsam Abbey , England.