Morning Sun is an unincorporated community in southeastern Israel Township, Preble County, Ohio, United States. It is located about 3.5 miles (5.6 km) south of Fairhaven at the intersection of State Routes 177 and 732 with Morning Sun Road, just north of Hueston Woods State Park. The community is part of the Dayton Metropolitan Statistical Area.
Morning Sun was platted in 1833. A post office was established at Morning Sun in 1836, and remained in operation until 1948.
Richard Elihu Sloan, the last Governor of Arizona Territory, was born in Morning Sun in 1857.