Trillium Charter School was a K–12 school located in Portland, Oregon, United States. In February 2019, Portland Public Schools revoked the school's charter. The school had failed to provide accurate financial statements and had failed to meet an improvement plan to increase academic competence.

Academics

In 2008, 55% of the school's seniors received a high school diploma. Of 20 students, 11 graduated, five dropped out, and four were still in high school the following year. In 2016, 70% of Trillium's students graduated on time out of a class size of 23.