The Spanish telephone numbering plan is the allocation of telephone numbers in Spain. It was previously regulated by the Comisión del Mercado de las Telecomunicaciones (CMT), but is now regulated by the Comisión Nacional de los Mercados y la Competencia (CNMC).

Before 1998, local telephone calls could be made using only the subscriber's number without the area code, while the trunk code '9' was omitted when calling from outside Spain, e.g.:

International calls were made by dialling the international access code 07, waiting for a tone, and then dialling the country code. However, calls to Gibraltar were made using the prefix '956' for the province of Cádiz, followed by the digit '7', instead of the country code +350, e.g.:

Similarly, calls to Andorra were made using the prefix '973' for the province of Lleida followed by the digit '8', e.g.:

It was also possible to call Andorra from other countries via Spain using the prefix +34 738 instead of via France using the prefix +33 628. However, on 17 December 1994, Andorra adopted its own country code +376, with '8' being added to the subscriber's five-digit number, meaning that international dialling was required from Spain, e.g.:

Mobile phone numbers began with the prefix '90x' or '9x9', e.g.:

On 1 December 1998, Spain changed to a new telephone numbering plan. Under the closed numbering plan with the trunk prefix '9' being incorporated into the subscriber's number, so that a nine-digit number was used for all calls, e.g.:

Mobiles similarly changed, and were now prefixed with the digit '6':