The 21st Edition Vuelta a España (Tour of Spain), a long-distance bicycle stage race and one of the three grand tours, was held from 28 April to 15 May 1966.

It consisted of 18 stages covering a total of 2,949.5 km (1,832.7 mi), and was won by Francisco Gabica of the Kas–Kaskol cycling team.

Jos van der Vleuten won the points classification and Gregorio San Miguel won the mountains classification.

[1] General classification(la roja) Points classification(jersey verde) Mountains classification(jersey puntos azules) Young rider classification(jersey blanco) Team classification(clasificación por equipos) Combativity award