奥克拉荷马州立大学静水市校区（Oklahoma State University-Stillwater，简称Oklahoma State、OK-State或OSU）是一所四年制公立大学，位于奥克拉荷马州斯蒂尔沃特(Stillwater)，是俄克拉荷马州立大学系统的主校区。该校是男女同校的赠地大学。

该校于1890年成立由土地拨赠法案成立，前身属俄克拉荷马农业及机械学院（Oklahoma Agricultural and Mechanical College)。2012年秋季学期，该校注册人数为25544人（包括静水校区和塔尔萨校区），当年新生人数为4298人。该校被卡内基教学促进基金会(Carnegie Foundation for the Advancement of Teaching)列为高研究活动的研究性大学。

Oklahoma State University (also referred to informally as Oklahoma State, OKState, O-State, and OSU) is a land-grant, sun-grant, coeducational public research university located in Stillwater, Oklahoma, United States. OSU was founded in 1890 under the Morrill Act. Originally known as Oklahoma Agricultural and Mechanical College (Oklahoma A&M), it is the flagship institution of the Oklahoma State University System. Official enrollment for the fall 2010 semester system-wide was 35,073, with 23,459 students enrolled at OSU-Stillwater. Enrollment shows the Freshman class of 2012 was the largest on record with 4,298 students. OSU is classified by the Carnegie Foundation as a research university with high research activity.