| yes | No | invalid/blank | registered voters | question | name | place | follows | date |
|---|---|---|---|---|---|---|---|---|
| 1978 Spanish constitutional referendum | Spain | 1976 Spanish political reform referendum | 06/12/1978 | |||||
| 1976 Spanish political reform referendum | Spain | 1966 Spanish organic law referendum | 15/12/1976 | |||||
| 1966 Spanish organic law referendum | Spain | 1947 Spanish law of succession referendum | 14/12/1966 | |||||
| 1986 Spanish NATO membership referendum | Spain | 1978 Spanish constitutional referendum | 12/03/1986 |