Mussoorie International School (MIS) is an all-girls residential school in Mussoorie, Uttarakhand, India.

Established in 1984, MIS is affiliated to the Council for the Indian School Certificate Examinations (CISCE code UT026), New Delhi and University of Cambridge International Examinations (CIE) and IBDP.

The school is located in a 40-acre (16 ha) campus in the hills of Mussoorie. MIS students are divided into three houses: Laxmi (orange), Santoshi (yellow), and Gayatri (blue)