Constituent Cortes (Cortes constituyentes) is the description of the Cortes (Spanish parliament) when convened as a constituent assembly.
In the 20th century only one Constituent Cortes was officially opened ("Cortes" are "opened" in accordance with a mediaeval royal proclamation), and that was the Republican Cortes in 1931.
The Cortes in 1977 passed the new Spanish constitution; however, that was never officially considered "constituent", as the 1977 general elections were not mandated to consider a new constitution, but to rule under the constitution of the former dictatorship - the so called "Leyes Fundamentales" (fundamental laws).
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