Morgan County Courthouse is a historic courthouse located at Martinsville, Morgan County, Indiana. It was built between 1857 and 1859, and is a 2+1⁄2-story, Italianate style brick and stone building. It has a cruciform plan and features a five-level free-standing campanile. Additions were made in 1956 and 1975–1976. Associated with the courthouse is the original annex or Sheriff's House. It is a two-story, five bay by two-bay, I-house.

It was listed on the National Register of Historic Places in 1996. It is located in the Martinsville Commercial Historic District.