The Midwest Old Threshers Reunion is an annual event that takes place in the small town of Mt. Pleasant, Iowa, United States, and runs for five days, ending on the Labor Day weekend. It was first held in 1950, and has taken place every year except 2020, when it was cancelled due to the COVID-19 pandemic. When it first started, it focused on steam engines and antique agricultural equipment, but has developed into an entertainment event with a wider remit. The tiny town of less than 10,000 inhabitants receives thousands of visitors from around the world.

Mount Pleasant is a city in and the county seat of Henry County in the U.S. state of Iowa. The population was 9,274 in the 2020 census, an increase from 8,668 in the 2010 census. It was founded in 1835 by pioneer Presley Saunders.