Guinea pig CCL11 (C-C motif chemokine ligand 11), also known as eotaxin-1, is a member of the CC chemokine family that plays a central role in regulating eosinophil recruitment and type 2–associated immune responses in guinea pigs (Cavia porcellus). CCL11 is produced primarily by epithelial cells, fibroblasts, endothelial cells, and activated immune cells in response to Th2-associated cytokines such as IL-4 and IL-13, and it functions predominantly through the CCR3 receptor to promote chemotaxis and activation of eosinophils, as well as certain Th2 lymphocytes and basophils. In healthy guinea pigs, basal CCL11 expression is typically low, but levels increase during allergic inflammation, parasitic infection, airway hyperresponsiveness, and experimental immune stimulation. In biomedical research, guinea pig CCL11 is particularly relevant in models of asthma, allergic airway inflammation, anaphylaxis, and helminth infection, where eosinophilic infiltration and Th2 polarization are key features of disease pathology. Characterization of CCL11 in guinea pigs provides valuable insight into eosinophil biology, chemokine-driven leukocyte trafficking, and mechanisms underlying allergic and type 2–mediated inflammatory responses in translational respiratory and immunology research.