Histone deacetylases (HDACs) are enzymes that regulate protein functions by catalyzing the removal of acetyl and acyl groups from lysine residues, which play pivotal roles in governing cell behaviors. HDAC11 knockout mice are resistant to high-fat diet-induced obesity and metabolic syndrome, suggesting that HDAC11 functions as a crucial metabolic regulator. HDAC11 is a novel regulator of obesity, with potentially important implications for obesity-related disease treatment. HDAC11 has therapeutic potential for treating diabetes mellitus-associated cardiac injury. Histone deacetylases (HDACs) are involved in multiple physical and pathological processes in classical Hodgkin lymphoma (cHL). HDAC11 was initially identified as a negative regulator of the well-known anti-inflammatory cytokine IL-10.