Sir Arthur Haselrig, 2nd Baronet (1601 – 7 January 1661) was a leader of the Parliamentary opposition to Charles I and one of the Five Members whose attempted arrest sparked the 1642–1646 First English Civil War. He held various military and political posts during the 1639–1651 Wars of the Three Kingdoms but became an opponent of Oliver Cromwell during the Protectorate. In 1660, his actions inadvertently helped restore Charles II to the throne; unlike many senior Parliamentary leaders, his life was spared but he was confined to the Tower of London, where he died on 7 January 1661.