This introductory chapter of the section “Spatial Grammars of Breath” brings together geographers, anthropologists, STS scholars, architects, and artists to examine how breathing enacts, creates, and complicates spaces—and how spaces, in turn, craft breathing and breath relations. This section asks how we understand the relations between breathing and spaces: bending enclosures into volumes, folding outsides into insides, and stretching distances into shared respiratory predicaments. Five contributions develop distinct sets of spatial grammar—Enclosure/Volume, Inside/Outside, Breathing Inequalities, Geographic Breathing Machines, and Clouds/Residues/Futures. These grammars move topologically from depths to heights, interiors to exteriors, and particles to clouds; and point to the emergence of four cross-cutting patterns: the scalar politics of breathable worlds, vertical and volumetric reconfigurations, the epistemic significance of bodily sensing, and respiratory processes as world-making. Together, these contributions reposition breathing spaces as a locus for collective intervention, inviting readers to ask not only where we breathe but also how breathing remakes shared worlds.