Basque Auxiliary Navy

Basque Auxiliary Navy Marina de Guerra Auxiliar de Euzkadi Eusko Itsas Gudarostea
Churruca-class destroyer Císcar of the Basque Auxiliary Navy
Active	1936–1937
Country	Spain
Branch	Spanish Republican Navy
Type	Navy
Role	Coastal defence and minesweeping
Engagements	Spanish Civil War
Commanders
Commander	Joaquín de Eguía y Unzueta
Insignia
Naval ensign
Naval jack

The Basque Auxiliary Navy (Spanish: Marina de Guerra Auxiliar de Euzkadi, Basque: Eusko Itsas Gudarostea) was a section of the Spanish Republican Navy operating in the Bay of Biscay between 1936 and 1937. The naval force began their operations in October 1936 at the behest of the autonomous Basque Government. The main Basque Navy base was at Portugalete.