STHS may refer to:
Education
United States
St. Thomas High School (Houston, Texas), a high school for boys in Houston, Texas, USA Santa Teresa High School, a high school in San Jose, California, USA South Tahoe High School, a high school in South Lake Tahoe, California, USA South Terrebonne High School, a high school Bourg, Louisiana, USA Springfield Township High School, a high school in Oreland, Pennsylvania, USA Sussex Technical High School, a high school in Georgetown, Delaware, USA
Worldwide
St. Thomas High School (Quebec), a high school in Pointe-Claire, Quebec, Canada
St. Thomas' High School, Jhelum, a high school in Jhelum, Punjab, Pakistan
St. Thomas High School, Honnavar, a high school in Uttara Kannada, Karnataka, India Sydney Technical High School, a high school for boys in Sydney, New South Wales, Australia
Other uses
Saint Thomas Health Services, a not-for-profit group of Middle Tennessee hospitals based in Nashville, Tennessee, USA