1189 Terentia, provisional designation 1930 SG, is a carbonaceous Terentian asteroid from the outer regions of the asteroid belt, approximately 56 kilometers in diameter and the namesake of its family.

The asteroid was discovered by Russian astronomer Grigory Neujmin at Simeiz Observatory on 17 September 1930.

[4] Terentia orbits the Sun at a distance of 2.6–3.3 AU once every 5.01 years (1,832 days).

[15] In the SMASS taxonomy, is classified as a Ch-type, a hydrated subtype of the carbonaceous C-type asteroids.

[1] This minor planet was named after Lidiya Terent'eva (1879–1933), female collaborator at the Simeis Observatory.