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Here, we demonstrate that macrocyclic steric confinement at heavy\u2010atom sites unlocks a previously inaccessible spin\u2010transport regime in OSCs, in which efficient spin diffusion and long\u2010lived spin coherence intrinsically coexist. Employing a previously reported macrocyclic\u2010confined thiophene\u2010based OSC as a model system, we show that a covalently linked macrocycle enforces a highly linear conjugated backbone while dispersing spin density away from heavy atoms. This unique combination suppresses spin\u2010orbit coupling while preserving strong charge delocalization. Thus, the macrocyclic\u2010confined molecule exhibits a concurrent and marked enhancement in both intrinsic spin diffusion coefficient and spin lifetime in pristine thin films. When implemented in organic spin valves, this molecule delivers a room\u2010temperature spin diffusion length of 322\u00a0nm together with a spin lifetime of 253\u00a0\u00b5s, setting new benchmarks of both metrics for organic spintronic materials. These findings reveal how macrocyclic steric confinement fundamentally reshapes spin\u2010orbit coupling in conjugated systems and establish a general chemical principle for reconciling structural order with long\u2010lived spin coherence in OSCs.<\/jats:p>","DOI":"10.1002\/anie.9997737","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T03:37:42Z","timestamp":1788925062000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Macrocyclic Steric Confinement at Heavy\u2010Atom Sites to Suppress Spin\u2010Orbit Coupling for Room\u2010Temperature Spin Transport in Organic Semiconductors"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-7084-479X","authenticated-orcid":false,"given":"Meng","family":"Wu","sequence":"first","affiliation":[{"name":"Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology  Beijing P. 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