In this article, the author strengthens and develops the theoretical platform for her concept of little public spheres. Hickey-Moody does so in order to present the concept as a tool for theorists who want to consider the political significance of marginalized youth. The concept of little publics is a theoretical frame the author developed to show how the acts, styles, and life choices of young people are civic actions that have, or can have, political significance. Reading young people's acts as an expression of their opinion, as youth voice, little publics shows how voice is made from the materiality of action. Hickey-Moody begins this article with a definition of how she uses little public spheres; situates the concept in a history of scholarship on the public sphere, intimate and globalizing publics, public pedagogy and youth voice. Hickey-Moody articulates how and why she has developed the concept to think through youth voice and youth agency. The article closes with suggestions for how the concept of little public spheres might be taken up by those interested in youth citizenship, civics, and publics.