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St. Gregory's University was a private Catholic university. It was one of the oldest institutions of higher learning in the U.S. state of Oklahoma. It had its main campus in Shawnee and an additional campus in Tulsa. The university closed its operations at the end of the fall 2017 semester.

In December 2018 the sale of the Shawnee campus to Hobby Lobby was approved by the bankruptcy court. The campus was leased to Oklahoma Baptist University (OBU), a private Christian university in Shawnee. In May 2019, OBU renamed the tract as the OBU Green Campus, both in honor of the Green family, owners of Hobby Lobby, and because the color green is one of OBU’s official university colors. In December 2019, Hobby Lobby and the Green family donated the campus to OBU. OBU also retains academic records from St. Gregory's, including student transcripts.