This article examines linguistic variation in relation to the critical social institution and social domain of education, with an emphasis on linguistic inclusion, focusing on the United States. Education is imbued with power dynamics, and language often serves as a gatekeeping mechanism for students from minoritized backgrounds, which helps create, sustain, and perpetuate educational inequalities. Grounded in this context, the article reviews intersecting factors related to linguistic variation that affect student academic performance. Empirical and applied models of effective partnerships among researchers, educators, and students are presented, which provide road maps to advance linguistic inclusion in schools within the broader social movement for equity in education. Expected final online publication date for the Annual Review of Linguistics, Volume 10 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.