The Loevestein faction (Dutch: Loevesteinse factie) or the Loevesteiners is a different name for the Dutch States Party in the second half of the 17th century in the County of Holland, the dominant province of the Dutch Republic. It claimed to be the party of 'true freedom' against the stadtholderate of the House of Orange-Nassau, and sought to establish a purely republican form of government in the Northern Netherlands.
The name Loevestein refers to Loevestein Castle. There, stadtholder William II locked up six members of the States of Holland and West Friesland during his coup d'état of 30 July 1650. Amongst them was the burgomaster of Dordrecht, Jacob de Witt (father of Johan and Cornelis de Witt). After pressure by the States of Holland, they were already subsequently released between 17 and 22 August 1650. Jacob de Witt lost all his functions, but when William II died several months after his coup, Jacob retrieved most of his functions. These events made the term Loevestein faction synonymous for pro-States regenten who opposed the stadtholderate. The De Witt family, too, walked over to the States camp after this incident.
The term "Loevestein faction" was invented by their Orangist adversaries. It has been suggested that Jacob had 'poisoned' his sons with anti-Orange sentiments, and he allegedly told them every day to 'Gedenck aan Loevesteyn' ("Remember Loevestein"), although this is disputed. From the 1660s onwards, the Prince's supporters would start identifying the Brothers de Witt with earlier States supporters such as Johan van Oldenbarnevelt (executed for his opposition against Maurice of Nassau) and Hugo Grotius (sentenced to life imprisonment in Loevestein in 1619 at Maurice's instigation, but he escaped in a book chest in 1621). After the assassination of the Brothers de Witt in 1672, their allies started doing the same, reappropriating the word "Loevesteiner".