Trillium International School

A small bilingual Montessori primary in Marly-le-Roi, about 30 minutes west of central Paris, for children from 18 months to age 10.

Trillium opened in late 2017 and was set up by parents who could not find a bilingual nursery and primary willing to support children with specific learning needs. Maximum class size is around 12, the pedagogy is Montessori, and the curriculum blends French and English national content so that children can transfer in and out of either system without falling behind.

Parents describe the team as kind and attentive and the setting as calm and family-like, which lines up with the original founding intent. The school works well for families who want the small-group Montessori feel through primary, particularly where a child needs a softer landing than a larger international school can offer. Marly-le-Roi is a fair commute from central Paris, so practical fit depends heavily on where you live in the western suburbs.

• Parent reviews are consistently positive about the bilingual programme, small class sizes, warm atmosphere, and attentive support.
• Families praise the setting as calm and green, and describe children as feeling well supported and happy.
• A separate local review mirror is more mixed, including praise for the small, caring environment and a complaint about conflict with leadership. The stronger current parent-review set remains positive, but the overall pool is still small.