South Carolina Highway 177 (SC 177) is a 7.820-mile (12.585 km) primary state highway in the U.S. state of South Carolina.

It connects the community of Wallace with Hamlet, North Carolina.

The second appeared from 1938-1951 as a new primary routing from US 176 southeast of Pomaria to US 76/SC 2 near Ballentine.

It was adjusted twice, in 1948 extending and replacing SC 664, and in 1950 shifting to meet with US 176/SC 121 split.

[3][failed verification] Another SC 77 reappeared only appeared on South Carolina official maps in 1981-1982 as a proposed segment of Interstate 77 (I-77) from US 76/US 378 to I-20.