The Parking Regulatory Ordinance or Ordinance for the Regulation of Parking (ORA) is a municipal ordinance applied in several Spanish cities by which certain parking areas are established in which the user must purchase a ticket for their vehicle.

In some places it is known as O.T.A. (Traffic and Parking Ordinance[1]​ or Parking Pricing/Assessment Ordinance), O.L.A. (Parking Limiting Ordinance[2]​), ESRO (ROtative Parking or ROtation Regulated Parking[3]​) or S.E.R. (in Madrid[4]​) (Regulated Parking Service). There are also localities with a name specific to the ordinance, such as O.C.A. (Castro Parking Ordinance, in Castro-Urdiales[5]​).

Although parking areas (ORA zones) are usually delimited by blue stripes - hence they are called blue zone - currently some cities such as Madrid divide parking between residents -green zone- and visitors -blue zone-, allowing non-residents to also park in their spaces, although at a higher price and with a shorter time limit. Depending on the location, the color can have one meaning or another (exclusive parking area for residents, long-term parking area, short-term parking area...).

In any case, in the regulated area a maximum parking time is set based on the amount paid. The aim of these areas is to make the most of parking spaces, facilitating the rotation of vehicles, especially in the most central areas of large cities, where parking is a serious problem for drivers.

Users of public roads throughout Spain have the possibility of carrying out the Resident procedure of the city or town in question, in order to have access to parking without a time limit by paying a fee, generally annual. For this, it is necessary that the interested person be registered in the town to which they want to apply for the parking authorization. In most locations, this permit is delimited by zones, that is, residents will be able to park their vehicles within limits established by the local council, according to the location of the residence of the person involved.