Tsukuba International School (つくばインターナショナルスクール, TIS) is a private, non-profit school for English-speaking children in Tsukuba, Ibaraki, Japan. It was established by the foreign community in 1992 in response to the need for an English education option for foreign students in the area. The school currently includes a preschool, elementary school, middle school, and high school (pre-kindergarten to Grade 10).