State Road 608 (SR 608) is a 0.57-mile-long (0.92 km) east–west street serving the area north of Fort Pierce in St. Lucie County, Florida.

Locally known as St. Lucie Boulevard, the road extends westward and eastward as County Road 608 (CR 608).

The road becomes SR 608 at an intersection with SR 615, and the eastern terminus is an intersection with U.S. Route 1 (US 1 and SR 5), where the CR 608 designation resumes for one block to Dixie Highway (CR 605) in the Hunt Subdivision.

Originally, SR 608 extended westward another 3 miles (4.8 km), terminating at Kings Highway (SR 713), a heavily used two-lane road connecting Florida's Turnpike (SR 91) with US 1.

The entire route is in St. Lucie County.