Ermengarde or Erembourg of Maine, also known as Erembourg de la Flèche (died 1126), was Countess of Maine and the Lady of Château-du-Loir from 1110 to 1126. She was the daughter of Elias I of Maine, Count of Maine, and Mathilda of Château-du-Loire.

In 1109 she married Fulk V of Anjou, thereby finally bringing Maine under Angevin control. She gave birth to:

• Geoffrey V, Count of Anjou (d. 1151)
• Elias II of Maine (d. 1151)
• Matilda of Anjou (d. 1154), who married William Adelin, the son and heir to Henry I of England
• Sibylla of Anjou (d. 1165), married in 1121 to William Clito, and then (after an annulment in 1124) to Thierry, Count of Flanders

She died in 1126, on either the 15th January or the 12 October. After her death, Fulk left his lands to their son Geoffrey, and set out for the Holy Land, where he married Melisende of Jerusalem and became King of Jerusalem.