Oldenburg Academy of the Immaculate Conception

The Alma Mater is "virtue, honor, and education."

The school was founded in 1851 by the Sisters of St. Francis and Mother Teresa Hackelmeier.

Oldenburg Academy received its commission as a high school in 1910.

Currently, the school is controlled by a board of trustees rather than the original owners, the Sisters of St. Francis.

In 2020, the academy constructed a new athletic facility named the Hillenbrand Family Feldhaus.