Ohio State Route 123
|Maintained by ODOT|
|Length:||43.22 mi (69.56 km)|
|Existed:||1924 – present|
|South end:||SR 251 near Blanchester|
| I‑71 near Lebanon
I‑75 in Franklin
|North end:||SR 4 in Germantown|
|Counties:||Brown, Clinton, Warren, Montgomery|
State Route 123 (SR 123) is a state highway in southwestern Ohio. The route runs from SR 251 about 7 miles (11 km) southeast of Blanchester to Germantown at SR 4, a distance of 43.22 miles (69.56 km). The section of road from Franklin to Lebanon was originally a toll road until it was taken over by Warren County and made free for public use. 
Ohio Historical Marker #2-14 is located on State Route 123 near Blanchester. It commemorates the Garrison Corner Community which was settled by Lemuel Garrison, Sr., and included a school and cemetery.
- Ohio Department of Transportation. "Technical Services Straight Line Diagrams". Retrieved April 30, 2010.
- "TOWNSHIP PROFILE, HISTORY AND GENERAL CHARACTERISTICS". Clear Creek Township. Retrieved 21 February 2014.
- "Marker #2-14 Garrison Corner Community". The Ohio Historical Society. Retrieved 21 February 2014.
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