The Patrick Military Institute was an American military school founded in South Carolina by Colonel John Bellinger Patrick.

The institute was initially founded in 1878 as the Greenville Military Institute, when Patrick converted the Greenville, South Carolina high school into a military-style academy for secondary education.

In need of a larger campus in 1887, Patrick relocated the school into the buildings of the former Carolina Collegiate Institute in Anderson, South Carolina, where it was renamed the Patrick Military Institute.

Colonel Patrick died in September 1900 and the school was closed that same year.

A faculty of 6 teachers and 3 lecturers taught an academic curriculum which included English, German, French, Greek, Latin, Mathematics and Bookkeeping as well as Military Science and Tactics.