This article defends an account of collective hope that arises through solidarity in the pursuit of justice. I begin by reviewing recent literature on the nature of hope. I then explore the relationship between hope and solidarity to demonstrate the ways in which solidarity can give rise to hope. I suggest that the hope born of solidarity is collective when it is shared by at least some others, when it is caused or strengthened by activity in a collective action setting, and when the reciprocal hopeful expressions of individual group members result in an emotional atmosphere of hope that extends across the group. In the context of social movements, collective hope emerges alongside the collective intentions and actions of the solidarity group; namely, in the pursuit of a form of social justice that inspires the movement. I then suggest that the object of collective hope born of solidarity is the guiding ideal of justice and reflect on what it might mean to hope well for justice.