<p>Given the fundamental biological importance of lipids not only as structural components and energy substrates but also as potent bioactive molecules that govern immune and oncogenic signaling, lipid metabolism reprogramming has emerged as a central driver of tumor progression. Rather than merely fueling tumor growth, this extensive metabolic rewiring profoundly reshapes the tumor microenvironment (TME), establishing complex metabolic crosstalk that actively drives immune evasion. This review examines the current understanding of lipid metabolism reprogramming across different cellular compartments within the TME and its far-reaching implications for cancer immunotherapy. We first delineate how altered lipid metabolism directly fuels tumor cell proliferation, survival, and metastatic potential. We then examine the distinct lipid metabolic patterns in different immune cells, detailing how this reprogramming drives dysfunction in antitumor subsets such as CD8⁺ T cells and natural killer cells and how it promotes immunosuppressive populations such as tumor-associated macrophages and myeloid-derived suppressor cells. In addition to these immune alterations, we address the metabolic rewiring of stromal cells, particularly cancer-associated fibroblasts. Furthermore, by exploring intricate intercellular crosstalk, we highlight how tumor lipid metabolism promotes immune escape and how lipids from reprogrammed immune and stromal cells, in turn, support tumor growth, thereby reinforcing an immunosuppressive niche. Finally, we highlight emerging therapeutic strategies targeting these pathways and discuss how&#xa0;leveraging multiomics advances can translate lipid insights into cancer immunotherapy.</p>