Lipid molecules function as sophisticated immune regulators through specialized mediators including eicosanoids, resolvins, and ceramides that control inflammatory responses and resolution pathways. These lipids directly influence both innate and adaptive immune cell signaling, representing a distinct biological axis beyond their traditional roles as energy storage or membrane components. This regulatory system becomes critically dysregulated in chronic inflammatory diseases like atherosclerosis, obesity, and type 2 diabetes, where impaired lipid metabolism perpetuates persistent immune activation. The lipid-immune interface also emerges as a battlefield in infectious diseases, with pathogens actively hijacking host lipid pathways to evade immune surveillance. This mechanistic understanding opens therapeutic opportunities using targeted interventions like omega-3 fatty acids, statins, or specialized pro-resolving mediators rather than broad immunosuppression. The field represents a paradigm shift from viewing lipids as passive structural elements to recognizing them as active immune modulators. However, significant knowledge gaps remain in understanding how different lipid species coordinate with immune pathways, highlighting the need for integrated lipidomic-immunologic research approaches to fully exploit this axis for therapeutic benefit.