As Allan Johnson (2000) noted,“The simple truth is that [social injustice] can’t be solved unless people who are heterosexual or male or Anglo or White or economically comfortable feel obligated to make the problem of privilege their problem and to do something about it”(p. 10). This chapter explores ways in which college students have come to do something about it, looking first at general theories of student learning and change during college, models of ally development based on noncollege populations, and Broido’s model of college student ally development. The chapter closes with a discussion of ways in which the college environment can be shaped to foster the development of allies.