An ayuntamiento is the body charged with the government and administration of the municipalities in Spain not bound to the regime of concejo abierto ('open council'). The ayuntamiento is one of the bodies charged with local government in Spain.
The ayuntamiento is made up of the mayor, deputy mayors and councillors and, in larger municipalities, an executive committee. Councillors are elected by universal suffrage and secret ballot and they in turn elect the mayor.
An ayuntamiento is made up of a mayor (Spanish; Castilian: [[alcalde]]) and the elected councillors, who compose the plenary (Spanish; Castilian: pleno), the deliberative body. In municipalities with over 5,000 inhabitants, there is also an executive committee (Spanish; Castilian: junta de gobierno or Spanish; Castilian: comisión de gobierno or Spanish; Castilian: consejo de gobierno). Such a committee is optional for smaller municipalities, at the discretion of the plenary or the regulations of the ayuntamiento. The executive committee is made up of a number of the elected councillors.
The ayuntamiento follows a collegiate-representative model, with features of a Corporatism such as the fact that the mayor is president of both the plenary and the executive. While the plenary retains the vote of censure to remove the mayor, the system confers much power upon the mayor, which has become a point of controversy.
The organizational system is described in the 1985 Local Government Act. An 11/1999 Law superseding some features of the 1985 Act set increased powers for the mayor, but the plenary also gained more scrutiny over these powers. The plenary lacks legislative autonomy.
The municipalities of Madrid and Barcelona have special rules, regulated by the 22/2006 Law of the Capital in the case of the Ayuntamiento of Madrid and by the Municipal Charter of Barcelona, approved in the 22/1998 Catalan law in the case of Barcelona.
Municipal elections are held every four years on the same date for all municipalities in Spain. Councilors are allotted using the D'Hondt method for proportional representation with the exception of municipalities with under 100 inhabitants where block voting is used instead. The number of councilors is determined by the population of the municipality; the smallest municipalities having 5, and the largest – Madrid – having 57.
Unlike other European countries the mayor is not directly elected. They are invested by the councillors. The indirect election, stated in the 1978 Local Elections Act was confirmed in the General Electoral System Act of 1985.
The method by which the mayor is elected is as follows. If no head of list of each electoral list commands an absolute majority of the votes of the councillors in the plenary, the head of list of the most voted list becomes mayor.