SR 373 is a 4.46-mile (7.18 km) highway that connects the town of Greer in eastern Arizona with SR 260 west of Eagar.

The southern terminus of the highway is located on Main Street, at the northern terminus of Apache County Road 1120, in Greer.

SR 373 generally heads on a northerly course as it leaves Greer, reaching its northern terminus at SR 260.

[1][2] SR 373 was defined in 1961 by the Arizona Department of Transportation (ADOT) with exactly the same routing as it follows today.

[3] The entire route is in Apache County.