In this article, we describe an assignment that we have developed in our Engineering for Elementary Teachers course. The assignment was designed to address social justice within the engineering design process. In this course, preservice teachers (PSTs) develop an engineering project that integrates six criteria of engineering for social justice into their lesson plan as a way to make the social relevance of engineering more apparent. Beyond having teachers develop an engineering lesson plan, the goal is to increase awareness of the social justice dimension of engineering as a strategy for integrating culturally relevant pedagogies into engineering lessons. In this article, we share several lessons our PSTs have developed as well as insights that they gained about the relationship between engineering and social justice. We also share some of the challenges that the PSTs faced and the insights that we gained about integrating social justice criteria into engineering lessons.