Louise Garland Thomas High School, formerly known as the Long Bay High School^[1] is a senior high school in Long Bay, Providenciales, Turks and Caicos.

It opened on 7 September 2015, making it the second senior high on the island.^[2] 180 students were to be enrolled at the beginning.^[3] The school was initially housed at Clement Howell High School as the first building was not yet complete for its planned October opening.^[4] In that period Clement Howell and Long Bay students attended classes together, although the latter already began wearing their own uniforms.^[5] Initially the school had the first form, with second form coming afterwards and with a plan for it being a full high school. In October of that year Carlton Mills became principal.^[6]

The first Long Bay building, with a cost of $1 million U.S. dollars,^[7] opened in November that year.^[8] Construction of the second phase began that year.^[9] The institution's third block, which has classrooms and laboratories for science classes, opened in 2018.^[10]

In 2017 the Turks and Caicos Sun stated that "reliable sources" indicated overcrowding and a negative "temperament" of the principal.^[11]

The school uniform consists of a white shirt, grey slacks and suit coat, and a yellow tie. Deandra S Hamilton of Magnetic Media reported that there were concerns that the uniform was unsuited for the local climate.^[12] Long Bay students began wearing the Long Bay uniform from the beginning, when students were located at Clement Howell.^[5]