Harrow's headmaster Jon Standen said: "We have decided in the interests of both our school community and the local community, for Harrow Bangkok to close for six school days, from February 28 until March 6 2020, inclusive.
"This is in the interests of health and safety, to prevent the potential spread of COVID-19 in our community. Harrow Bangkok has taken all necessary steps as required to prevent the spread of COVID-19. Neither student nor staff in our School has been diagnosed with COVID-19.
"This decision has been taken in consultation with the Secretary of the Office of Private Education Commission.
"We will review this decision on Friday, March 6, taking a view as to whether it is possible to reopen the school on Monday, March 9."
During the school closure, teachers have been delivering live video lessons and using technology to share projects, experiments and lessons.