We are delighted to announce that our first school outside the UK will open in September 2025. In partnership with Ornsirin, a leading property developer, this exciting collaboration will establish an English international school in the picturesque and historic city of Chiang Mai, Thailand.

Ornsirin will invest in the construction of a new school, which will operate under our prestigious Mill Hill School brand, which is renowned for its commitment to educational excellence since 1807.

The school is set to open initially as pre-prep and prep school, with Kate Simon, the current Head of Grimsdell, Mill Hill Pre Prep appointed as the founding Head. The school will offer a world-class curriculum designed to foster both academic and personal growth, ensuring pupils are well-prepared for future challenges while benefiting from new state-of-the-art facilities. The campus will feature a replica of the iconic Mill Hill pillars. These will stand as proudly as they currently do at the original site in London; bringing the School’s heritage across the globe.

“I am thrilled to be part of this new exciting project with Mill Hill. Our school aims to be the top international school in northern Thailand, fostering students with strong character, integrity, and academic excellence as the region's first British school”. Dr Yuthachai Damrongmanee, Director of Mill Hill International School Thailand.

“I am honoured to become the founding Head at Mill Hill’s first overseas venture in beautiful Chiang Mai. A school which represents a fusion of two distinct cultures, combining the beauty and spirit of the Asian community with the rigorous British curriculum that Mill Hill offers. After over a decade at Grimsdell, this is an exciting step for me and my family. I will cherish the memories made with our wonderful children, staff, and families, and will deeply miss our community. However, I look forward to this new chapter in my career and one which allows me to remain part of the Mill Hill family.” Kate Simon, Founding Head Mill Hill International School Thailand.

“From my first meetings with the team at Ornsirin, and my visit to the school site in Chiang Mai, it has been clear that we have formed a great relationship with like-minded partners to develop a new school that brings the spirit of Mill Hill to a wonderful part of Thailand. I am looking forward to working closely with the team and seeing the school’s growth”. Antony Spencer, CEO Mill Hill Education Group.