Tjerk Hiddes de Vries (Sexbierum, 6 August 1622 - Flushing, 6 August 1666) was a naval hero and Dutch admiral from the seventeenth century. The French, who could not pronounce his name, called him Kiërkides. His name was also given as Tsjerk, Tierck or Tjerck.
Tierck was born in 1622 in the province of Fryslan (Friesland), in the village of Sexbierum, in Frisia, as the son of a poor farmer called Hidde Siurds and his wife Swab Tjeirckdochter. At the age of twelve, he went to sea. In 1648 he married Nannetje Atses; the couple settled in Harlingen, Frisia's main port. In 1654 he had attained the rank of master.
During the Northern Wars Tjerk was appointed captain of a troop transport, the Judith, that in 1658 was part of Lieutenant-Admiral Jacob van Wassenaer Obdam's expeditionary fleet against Sweden to relief Copenhagen. In the Battle of the Sound the sea soldiers of the Judith boarded and captured three Swedish vessels. He was rewarded for this by being appointed extraordinary captain with the Admiralty of Frisia, one of the five autonomous Dutch admiralties.
During the Second Anglo-Dutch War Tjerk was appointed full captain on 27 March 1665. He commanded d' Elff Steden in the Battle of Lowestoft, managing with great personal courage to free his ship from an entanglement with several other burning Dutch vessels, set alight by an English fireship. This fight was a severe defeat for the Dutch and those who by their bravery set a contrast to the general incompetence shown during the battle, were hailed as heroes by the populace. Tjerk in a written report severely criticised his fallen supreme commander Van Obdam. The Frisian admiralty board, in need to replace the also killed Lieutenant-Admiral of the Frisian fleet, Auke Stellingwerf, and sensing the public mood, appointed Tjerk Lieutenant-Admiral of Frisia on 29 June 1665. He thus jumped two ranks, not an uncommon occurrence for the Dutch navy in that century.