<p>Stereochemistry, the study of the spatial arrangement of atoms within molecules, has emerged as one of the most transformative branches of organic chemistry, intricately linked to biology, pharmacology, and materials science. This article presents a historical exploration of the development of organic stereochemistry, from early empirical discoveries to the theoretical breakthroughs that defined the field. It revisits the foundational experiments of Louis Pasteur, who, in the mid-nineteenth century, first separated mirror-image tartrate crystals and introduced the idea that molecular asymmetry could be biologically derived. The subsequent contributions of Van 't Hoff and Le Bel, who independently proposed the tetrahedral carbon model in 1874, marked a pivotal advancement in understanding three-dimensional molecular structures. These insights not only explained optical activity but also laid the conceptual groundwork for modern structural chemistry. Recent advances continue to push the boundaries of stereochemical science, but their roots lie in a continuum of pioneering ideas and observations. The structural formulas of August Kekulé helped shape the visual language of molecular structure. Arthur Cushny’s integration of stereochemistry with pharmacology heralded the birth of chiral drug science. Emil Fischer's lock-and-key hypothesis and his work on carbohydrate stereochemistry opened the door to understanding biological recognition. Arnaldo Piutti’s early insight into enantioselective receptor interactions marked the first recognition of stereochemical discrimination at biological targets. The geometric perspective offered by the Easson-Stedman model deepened our comprehension of molecular interactions in biological systems. Meanwhile, Alfred Werner’s revolutionary work on coordination compounds and molecular geometry extended stereochemical principles beyond carbon, profoundly influencing modern inorganic and medicinal chemistry. By revisiting the landmark moments and scientific pioneers that shaped this field, this article aims to contextualize current developments within a rich historical framework. It affirms that a deep appreciation of stereochemistry’s past can inspire and inform its future by bridging the legacy of molecular handedness with the promise of new chemical frontiers. </p>