Significant scholarly attention has been paid to politicized conservative religion, especially the Religious Right and white Christian nationalism. But the common assumption is that religious conservatives face off primarily against secular liberals. This leads many to overlook the active world of progressive religious activism. The field of progressive religious activism, sometimes called the “Religious Left,” attracts a racially and religiously diverse set of participants, including many nonwhite Christians and non‐Christians, some white mainline Protestants and Catholics, and occasionally white evangelical Protestants. These varied groups often join in multifaith coalitions that may also include secular partners. Progressive religious activists have played a major role in US political history, whether through actions taken within liberal congregations, faith‐based community organizations, or social movements. Religion, however, is increasingly associated with conservatism in the US, raising questions about what influence this diverse and loosely organized “Religious Left” will have on American politics in the future.