Florida State Road 423

State Road 423 and County Road 423
State Road 423 and County Road 423
County Road 423
	SR 423 in red, CR 423 in blue
Route information
Length	21.33 mi (34.33 km) 7.533 miles (12.123 km) as SR 423
Existed	early 1970s–present
Major junctions
South end	John Young Parkway in Hunters Creek
	SR 417 in Hunters Creek; SR 528 near Williamsburg; I-4 in Orlando; SR 408 in Orlando; US 441 in Orlando; I-4 in Orlando;
East end	US 17 / US 92 in Winter Park
Location
Country	United States
State	Florida
County	Orange
Highway system
	Florida State Highway System; Interstate; US; State Former; Pre‑1945; ; Toll; Scenic;

State Road 423 (SR 423), known for most of its length as John Young Parkway, and Lee Road east of Orange Blossom Trail, is a four- and six-lane surface road in the U.S. state of Florida. SR 423 runs from SR 408 north to U.S. Routes 17/92 (US 17/92) just east of Interstate 4 (I-4).

SR 423 and its southern components serve as an alternate to the parallel Orange Blossom Trail. The road is named after John Young, a NASA astronaut and one of twelve men to walk on the Moon, who was from the Orlando area.