Eustace II, (c.  1015–1020 – c. 1087), also known as Eustace aux Gernons (with moustaches) is Count of Boulogne from 1049–1087.

He fighs on the Norman side at the Battle of Hastings, and afterwards receives large grants of land forming an honor in England.

He is one of the few proven Companions of William the Conqueror.

It has been suggested that Eustace was the patron of the Bayeux Tapestry.