In 1970, the site on which the Dover Campus now stands was occupied by the St John's Army School, run by the British Army. Vacated by the British military on its withdrawal from Singapore, the Singapore International School was officially opened in August 1971 by the then Prime Minister, Lee Kuan Yew.
The establishment of the school was a result of agreement between Lord Mountbatten, then the President of the United World College (UWC) movement, and the Singapore government, who were equally keen to have a school for the education of expatriate children. The school was originally designated an associate member of the UWC movement, and subsequently became a full member in 1975, renaming itself the United World College of South East Asia.
The Dover Campus first opened with 900 students and 84 teaching staff. Initially a secondary school for Grades 6 -12, UWCSEA gradually expanded its age range from 1998 to include primary and kindergarten students. Today, Dover Campus educates over 2,900 students from over 60 nationalities in Kindergarten 1 to Grade 12. The students are taught by around 280 full and part time teachers from more than 25 nationalities.
In August 2008, a second campus - UWCSEA East - opened its doors. Initially operating in transition premises in Ang Mo Kio for the first three academic years, the newly constructed UWCSEA East Campus permanent premises in Tampines will offer an additional 2,540 students the life defining UWCSEA education when fully operational in 2015. The newly constructed campus, expected to set a benchmark in international school design, opened to the Infant School students in August 2010, with the remaining students in Grades 2 - 6 moving from Ang Mo Kio in August 2011. They will be joined by the first intake of Grades 7 to 10.
In 1970, the site on which the Dover Campus now stands was occupied by the St John's Army School, run by the British Army. Vacated by the British military on its withdrawal from Singapore, the Singapore International School was officially opened in August 1971 by the then Prime Minister, Lee Kuan Yew. 
The Dover Campus first opened with 900 students and 84 teaching staff. Initially a secondary school for Grades 6 -12, UWCSEA gradually expanded its age range from 1998 to include primary and kindergarten students. Today, Dover Campus educates over 2,900 students from over 60 nationalities in Kindergarten 1 to Grade 12. The students are taught by around 280 full and part time teachers from more than 25 nationalities.
the remaining students in Grades 2 - 6 moving from Ang Mo Kio in August 2011. They will be joined by the first intake of Grades 7 to 10.