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.
| Race details | |||||||||||||||||||||||||||||
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| Dates | 28 April – 15 May | ||||||||||||||||||||||||||||
| Stages | 18 | ||||||||||||||||||||||||||||
| Distance | 2,949.5 km (1,833 mi) | ||||||||||||||||||||||||||||
| Winning time | 78h 53′ 55″ | ||||||||||||||||||||||||||||
| Results | |||||||||||||||||||||||||||||
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| Stage | Date | Course | Distance | Type | Winner | |
|---|---|---|---|---|---|---|
| 1a | 28 April | Murcia – Murcia | 111 km (69 mi) |  Bruno Sivilotti (ITA) |
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| 1b | 28 April | Murcia – Murcia | 3.5 km (2 mi) |  |
Individual time trial |  José María Errandonea (ESP) |
| 2a | 29 April | Murcia – La Manga | 81 km (50 mi) | Enzo Pretolani (ITA) |
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| 2b | 29 April | La Manga – Benidorm | 153 km (95 mi) | Ramón Mendiburu (ESP) |
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| 3 | 30 April | Benidorm – Valencia | 148 km (92 mi) | José Antonio Momeñe (ESP) |
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| 4 | 1 May | Cuenca – Madrid | 177 km (110 mi) | Valentín Uriona (ESP) |
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| 5 | 2 May | Madrid – Madrid | 181 km (112 mi) | Carlos Echeverría (ESP) |
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| 6 | 3 May | Madrid – Calatayud | 225 km (140 mi) |  Jo de Roo (NED) |
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| 7 | 4 May | Calatayud – Zaragoza | 105 km (65 mi) | Cees Haast (NED) |
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| 8 | 5 May | Zaragoza – Lleida | 144 km (89 mi) | Henk Nijdam (NED) |
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| 9 | 6 May | Lleida – Las Colinas | 128 km (80 mi) | Antonio Gómez del Moral (ESP) |
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| 10a | 7 May | Sitges – Barcelona | 40 km (25 mi) | Luis Otaño (ESP) |
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| 10b | 7 May | Barcelona – Barcelona | 49 km (30 mi) | Henk Nijdam (NED) |
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| 11 | 8 May | Barcelona – Huesca | 266 km (165 mi) | Mario Zanin (ITA) |
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| 12 | 9 May | Huesca – Pamplona | 221 km (137 mi) | Gerben Karstens (NED) |
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| 13 | 10 May | Pamplona – San Sebastián | 131 km (81 mi) | Cees Haast (NED) |
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| 14 | 11 May | San Sebastián – Vitoria | 178 km (111 mi) | Gregorio San Miguel (ESP) |
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| 15a | 12 May | Vitoria – Haro | 61 km (38 mi) | |
Individual time trial | Francisco Gabica (ESP) |
| 15b | 12 May | Haro – Logroño | 52 km (32 mi) | Gerben Karstens (NED) |
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| 16 | 13 May | Logroño – Burgos | 116 km (72 mi) | Henk Nijdam (NED) |
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| 17 | 14 May | Burgos – Santander | 226 km (140 mi) | Gerben Karstens (NED) |
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| 18 | 15 May | Santander – Bilbao | 154 km (96 mi) | Domingo Perurena (ESP) |
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| Total | 2,949.5 km (1,833 mi) | |||||
| Rank | Rider | Team | Time |
|---|---|---|---|
| 1 | Francisco Gabica (ESP) |
Kas-Kaskol | 78h 53′ 55″ |
| 2 | Eusebio Vélez (ESP) |
Kas-Kaskol | + 39″ |
| 3 | Carlos Echeverría (ESP) |
Kas-Kaskol | + 44″ |
| 4 | Luis Otano (ESP) |
Fagor | + 2′ 17″ |
| 5 | José Antonio Momeñe (ESP) |
Kas-Kaskol | + 2′ 25″ |
| 6 | Valentín Uriona (ESP) |
Kas-Kaskol | + 2′ 44″ |
| 7 | Antonio Gomez Del Moral (ESP) |
Kas-Kaskol | + 3′ 52″ |
| 8 | Cees Haast (NED) |
Televizier | + 3′ 55″ |
| 9 | Angelino Soler (ESP) |
Ferrys | + 4′ 37″ |
| 10 | José María Errandonea (ESP) |
Fagor | + 4′ 40″ |
| 11 | Sebastián Elorza (ESP) |
Kas-Kaskol | |
| 12 | Domingo Perurena (ESP) |
Fagor | |
| 13 | Gregorio San Miguel (ESP) |
Kas-Kaskol | |
| 14 | Mariano Díaz (ESP) |
Fagor | |
| 15 | José Manuel López (ESP) |
Fagor | |
| 16 | Eduardo Castello (ESP) |
Ferrys | |
| 17 | Jos van der Vleuten (NED) |
Televizier | |
| 18 | Aldo Moser (ITA) |
Vittadello | |
| 19 | Ramon Saez Marzo (ESP) |
Ferrys | |
| 20 | Juan María Uribezubia (ESP) |
Kas-Kaskol | |
| 21 | Gerben Karstens (NED) |
Televizier | |
| 22 | Henk Nijdam (NED) |
Televizier | |
| 23 | Luis Pedro Santamarina (ESP) |
Fagor | |
| 24 | Rik Wouters (NED) |
Televizier | |
| 25 |  Dieter Puschel (FRG) |
Wiels-Groene Leeuw |
