National Secondary Route 129, or just Route 129 (, or ) is a National Road Route of Costa Rica, located in the Heredia province.
In Heredia province the route covers Belén canton (La Ribera district), Flores canton (Llorente district).
As part of the OBIS improvements over Route 1, the intersection between that route and Route 129 saw gains in the widening of the lanes to improve traffic.