Mineralocorticoid receptor biology is the academic field dedicated to understanding the structure, function, and regulation of the mineralocorticoid receptor (MR). This research area encompasses the molecular mechanisms of ligand binding and activation, downstream signaling pathways, tissue-specific expression, and the diverse physiological roles of the MR in processes such as electrolyte homeostasis, blood pressure regulation, and inflammation, as well as its significant contributions to the pathogenesis of cardiovascular, renal, and metabolic diseases, highlighting its importance as a therapeutic target.