Margaret II of Avesnes (1311 - June 23 1356), was Countess of Hainaut and Countess of Holland (as Margaret I) from 1345 to 1356. Margaret was the daughter of William III of Hainaut and Holland (~1286-1337) and his wife, Jeanne of Valois (~1294-1342), and succeeded her brother following his death in battle.

On 26 February 1324 in Köln she married Ludwig IV of Bavaria.

See also: Counts of Hainaut family tree