Route 136 is a state highway in southwestern Connecticut, running from Darien to Easton.

The route was initially established in 1932 to serve the beach communities between Darien and Southport.

In Norwalk, it continues south, east, and northeast through the Rowayton section of the city before a 1.11 miles (2 km) section maintained by the city between the intersection of Wilson and Meadow Streets and the intersection of Water and Washington Street, after which it continues east across the Norwalk River, through a triangular one-way couplet and into Westport.

Between Easton center and Upper Stepney, the old turnpike is now part of Route 59.

[3] Maintenance of the coastal portion of old Route 136 in Westport and Fairfield was returned to the towns.