Spain is a signatory of the nuclear Non-Proliferation Treaty (NPT) and has signed and ratified the Comprehensive Test Ban Treaty (CTBT), being one of the 44 listed countries needed to sign and ratify for the CTBT to enter into force.

Spain's nuclear program began under the Franco regime and the first law on nuclear power was established in 1964. Construction of the country's first nuclear power plant began in 1965 at Zorita. Currently there are nine commercial power plants, with a design output of 7,400 MWe.

Spain is a member of NATO and participates in NATO's Nuclear Planning Group but has an agreement that no US/NATO nuclear weapons will be stored on its soil.

Read the profile on Spain from the Model Nuclear Inventory (pdf), produced by the Reaching Critical Will project of the Women's International League for Peace and Freedom.