The Línea P, also known as the Pyrenees Line, was a series of defensive fortifications constructed along Spain's border with France during the mid-20th century. Military historians often draw parallels between this defensive system and other contemporary fortifications like France's Maginot Line or Germany's Siegfried Line. The fortifications were built as part of Spain's strategic military planning during a period of international tension, though the line was never officially referred to as 'Línea P' in Spanish military archives.
The defensive works were sometimes called the 'Pérez Line' or, in Catalonia, the 'Gutiérrez Line' by local populations.