Spain

Article 72 states:

Those electors who foresee that they will not be in the district where they can exercise their right to vote, or who cannot be there in person, can send their vote by mail, upon request to the Provincial Delegation of the Electoral Census Office, with the following requirements:

• (a) The elector will request to the corresponding Delegation, from the day of the announcement until the tenth day before election day, a registration certificate in the census. Such a request can be made to any Post Office.
• (b) The request should be made personally. The officer in charge of receiving requests will demand to see a national identity document and verify it matches the signature. Under no circumstances will photocopies of national identity documents be accepted.
• (c) In case of illness or disability that impedes one from making a request in person, whose existence is documented by an official and free medical certificate, the request can be made on behalf of the elector by another person who is authorized by a notary or attorney through a document that is extended individually to each elector, on which there cannot be included multiple electors, nor can one person represent more than one elector…

Article 87 states:

Those voters who cannot read or who, being disabled, cannot take the ballot paper or place it inside the envelope and hand it to the President of the Polling Station, can be assisted, to undertake these actions, by a person they rely on.

Excerpts from the Organic Law on the Regime of General Elections (1987, last amended 2007)

Section 49, subsection 3 states:

Enhanced protection for persons with disabilities shall be provided to ensure they may exercise fully their rights and duties.

Section 49, subsection 4 states:

Persons with disabilities shall be afforded the protection provided by international agreements that safeguard their rights.

Excerpt from the Constitution of the Kingdom of Spain (1978, last amended 2018)