Trijn Rembrands (c. 1557–1638) was a woman involved in the events of the Spanish Siege of Alkmaar during the Eighty Years' War in 1573, when she allegedly served in the defence as a soldier.
She was married to the textile merchant Cornelis Reyersz. In 1661 described as an example of both men and women fighting with equal bravery during the war: public memorial ceremonies were held for her in 1777 and 1865, and she is the subject of an opera, Alkmaar Trijn.
