| State: | SC |
| Type: | SC |
| Route: | 903 |
| Map Custom: | yes |
| Length Mi: | 27.090 |
| Length Ref: | [1] [2] [3] |
| Established: | 1930 |
| Direction A: | South |
| Terminus A: | in Catarrh |
| Junction: |
|
| Direction B: | North |
| Terminus B: | in Lancaster |
| Counties: | Chesterfield, Kershaw, Lancaster |
| Previous Type: | SC |
| Previous Route: | 901 |
| Next Type: | SC |
| Next Route: | 905 |
South Carolina Highway 903 (SC 903) is a 27.09miles primary state highway in the U.S. state of South Carolina. It connects Lancaster to Darlington, Florence, and the Grand Strand.
SC 903 is a two-lane rural highway, from Catarrh to Lancaster. Control cities listed southbound include Myrtle Beach.
Established either in 1929 or 1930 as a new primary routing, it traversed from SC 35 in Catarrh to SC 9 in Midway.[4] [5] In 1949, SC 903 was extended north to its current northern terminus in Lancaster, replacing an old alignment of SC 9.