The Sagtikos State Parkway is a long north-south limited-access parkway in Suffolk County on Long Island in New York. The southern terminus of the route is at the Heckscher State Parkway and the Southern State Parkway in West Islip. The northern terminus is at the Northern State Parkway, where the parkway continues northward as the Sunken Meadow State Parkway. The parkway comprises the southern half of New York State Reference Route 908K, an unsigned reference route, with the Sunken Meadow State Parkway forming the northern portion. Commercial vehicles are restricted from using the freeway-standard highway, a restriction in place on most parkways in New York State.

As with many parkways in the Tri-State area, the Sagtikos is substandard, having no shoulders, tightly curved ramps, and a lack of adequate acceleration/deceleration lanes.

The parkway was opened in September, 1952 at a cost of $8 million and closed the highway loop on Long Island.