Oklahoma State Highway 63

State Highway 63 (abbreviated SH-63) is a 96.7 miles (155.6 km) state highway in southeastern Oklahoma. It runs from U.S. Highway 69 in Kiowa to the Arkansas state line. SH-1 forms a concurrency with SH-63 for 37.8 miles (60.8 km), nearly 40 percent of the highway's length. SH-63 has one spur route, designated as SH-63A.

SH-63 was added to the state highway system on November 6, 1935, as a short link highway between Talihina and SH-2. The highway was gradually extended to its present length between then and 1960. When the current incarnation of SH-1 was established, the middle of SH-63 was turned over to the new highway, leaving SH-63 in two separate parts. The two sections were connected via a concurrency in the early 1980s.