State Route 430 (SR 430, OH 430) is an east–west state highway in the northern portion of Ohio. The western terminus of State Route 430 is at an interchange with State Route 309 in Ontario. Its eastern terminus is at a T-intersection with State Route 603 just outside of Mifflin.

This state highway runs through portions of Richland and Ashland Counties. No part of State Route 430 is included as a part of the National Highway System.

State Route 430 was designated circa 1960 along the routing that it currently occupies. No changes of major significance have taken place to the highway since its inception.