National Tertiary Route 906, or just Route 906 (, or ) is a National Road Route of Costa Rica, located in the Guanacaste province. It is a road in the Nicoya Peninsula, it starts and ends at Route 150.
Currently a gravel road, Route 906 runs in parallel to Route 150 to the west. Together with Route 929 it is known as , the Milk Route. The route visits the towns of Piave, Corralillo and San Lázaro.
In Guanacaste province the route covers Nicoya canton (San Antonio district).
In late 2019 a pilot program with a new and cheaper asphalt paving procedure, using recycled materials, was put in place with initial tests over this gravel road.