Interest group scholarship has so far focused mainly on national politics and has had very little to say about interest groups in American cities, counties, school districts, and special districts. This special issue is a step toward remedying that: it is a collection of articles and essays that examine some of the interest groups that are commonly active in US local politics. The contributions herein discuss real estate developers, tenant organizations, teachers' unions, police unions, and local PACs—covering topics such as how they are organized, how they engage in local politics, some of the constraints on their influence, and the nuanced ways in which ideology and identities can sometimes shape what coalitions are possible in the local context. By bringing this work together in one place, in a journal devoted to research on interest groups, the hope is that this special issue will help to cement “interest groups in local politics” as the recognizable research focus it deserves to be.