In many countries, schools and classrooms are becoming increasingly diverse along a variety of dimensions, including migration; ethnic groups, national minorities and Indigenous peoples; gender; gender identity and sexual orientation; special education needs; and giftedness. To navigate this diversity, adopting a multidimensional and intersectional lens could help education systems promote equity and inclusion in education and foster the well-being and learning of all students. Such an approach could also support education systems in preparing all individuals so that they can engage with others in increasingly complex and diverse societies. To build equitable and inclusive education systems, analysing policy issues regarding governance arrangements, resourcing schemes, capacity building, school-level interventions, and monitoring and evaluation is key. The Strength through Diversity: Education for Inclusive Societies project seeks to help governments and education systems address diversity to achieve more equitable and inclusive education systems. This paper presents the project’s theoretical and analytical framework.