Public holidays
1666, España, País Vasco
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | Año Nuevo |
| 2 | Wednesday, 6 January 1666 | Epifanía del Señor |
| 3 | Thursday, 15 April 1666 | Jueves santo |
| 4 | Friday, 16 April 1666 | Viernes Santo |
| 5 | Monday, 19 April 1666 | Lunes de Pascua |
| 6 | Saturday, 1 May 1666 | Fiesta del Trabajo |
| 7 | Sunday, 25 July 1666 | Santiago Apóstol |
| 8 | Sunday, 15 August 1666 | Asuncíon de la Virgen |
| 9 | Tuesday, 12 October 1666 | Fiesta nacional de España |
| 10 | Monday, 1 November 1666 | Todos los Santos |
| 11 | Monday, 6 December 1666 | Día de la Constitución Española |
| 12 | Wednesday, 8 December 1666 | Immaculada Concepcíon |
| 13 | Saturday, 25 December 1666 | Día de Navidad |