Glandorf is a village in Putnam County, Ohio, United States. The population was 1,001 at the 2010 census.

Glandorf was founded by Johann Wilhelm Horstmann and six other men from Glandorf, Germany in 1834.^: 3–6 They embarked on the ship Columbus on September 7, 1833, in Amsterdam, landed November 6, 1833 in New York, and purchased some estate in Putnam County in December. Members of this activity were Johann F. Kahle, Wilhelm Gülker, Christian Strop, F. Wischmann, Friedrich Bredeick and Mathias and Friedrich Bockrath. Kahle bought house at Greensburg nearly 5 miles to the west of Glandorf and named it “Maria Camp”. Horstmann’s house was named Glandorf. Their wives and ten further families from Glandorf followed in 1834. This was just the dawn of further emigration from Germany to Ohio and additional US states. After his death upon February 21, 1843, Horstmann left his land to the community.

In 1834, Horstmann built a log house to serve as church, school, and rectory. The extra parish was placed under the patronage of St. John the Baptist. In 1835, the log home was replaced by a wooden church in the express of a steeple, a terror and a pulpit from hallowed-out sycamore log. A brick church followed amongst 1846 and 1848. In 1878, the Neo-Gothic church St. John the Baptist was erected and consecrated upon December 15.^: 15 In 1992, a fire started in the sacristy of the church, and the sacristy and its contents were a firm loss. The entire interior had to be repainted. A convent of the German sisters’ order of the Society of the Precious Blood was founded in 1849. They cultivated the home which was originally owned by Horstmann and served as teachers. The convent was unaccompanied in 1917.

Glandorf is located at 41°1′49″N 84°4′45″W / 41.03028°N 84.07917°W / 41.03028; -84.07917 (41.030355, -84.079109).