In this essay, I examine unmet promises and global challenges for achieving language equality in schooling, with special focus on one of the United Nations’ Sustainable Development Goals, SDG-4, which aims to ensure equitable and inclusive quality education and lifelong learning for all. Language of instruction is a key determinant of student success, but there is limited recognition of the vital role language plays as an intervening variable. Most languages continue to be excluded from education and 60 percent of out-of-school children live in regions where their own languages are not used at school. Inequities arising from unjust language policies combine to trap the poorest in a cluster of disadvantages persisting across generations. Underinvesting in education jeopardizes a range of social benefits. A well-educated population will increase the overall economic prosperity of a nation. I call for first language–based multilingual education as a pathway to schooling equality and sustainable development.

Australia’s migration history has produced one of the most ethnically diverse nations in the world, but this has presented challenges for educational equity. The introduction of multiculturalism in the 1970s coincided with an increasing focus on structural inequities in education. In this essay, we examine the context of changing educational policies and programs over the last half century, arguing that there has not been a steady process of reform involving measures redressing various inequalities but a period of policy turbulence. We consider the impact of the competing logics of multiculturalism—incorporation, recognition, civility—upon educational policy and practice to argue that, together with the consequences of neoliberal reforms, the equitable delivery of multiculturalism in schools has proved challenging. We conclude that multicultural education must refocus on the critical capacities that teachers and students alike need to understand the cultural complexities of a globalized world.