National Directive Nucleus of the Guatemalan Party of Labour (in Spanish: Núcleo de Dirección Nacional del Partido Guatemalteco del Trabajo, PGT-NDN) was a splinter group of the Guatemalan Party of Labour (PGT).
A minority accused the leadership of being ambiguous towards the armed struggle against the regime.
Its leader was José Alberto Cardoza (nom de guerre: Mario Sánchez), who had been a PGT Central Committee member up to the split.
In 1982 PGT-NDN, EGP, ORPA and FAR formed URNG as a coordinating body.
After the 1983 capture of Carlos Quinteros ('Miguel'), who had been a leading figure in both PGT-NDN and PGT-PC, PGT-NDN was almost wiped out as Quinteros provided the state forces with vast information on their leaders and members.