Bovine CCL19 (C-C motif chemokine ligand 19), also known as macrophage inflammatory protein-3β (MIP-3β) or EBI1 ligand chemokine (ELC), is a member of the CC chemokine family that plays a central role in lymphocyte trafficking and organization of secondary lymphoid tissues in cattle (Bos taurus). CCL19 is primarily produced by stromal cells, dendritic cells, and macrophages within lymph nodes, spleen, and other lymphoid structures. It functions through the CCR7 receptor to direct migration of naïve T cells, central memory T cells, and mature dendritic cells to lymphoid tissues, facilitating antigen presentation and initiation of adaptive immune responses. In healthy cattle, CCL19 contributes to immune surveillance and maintenance of lymphoid architecture; however, expression may increase during infection, vaccination, or inflammatory stimulation. In veterinary and agricultural research, bovine CCL19 is of particular interest in studies of vaccine-induced immunity, lymphoid tissue organization, and host responses to pathogens such as bovine respiratory disease complex agents, bovine viral diarrhea virus (BVDV), and Mycobacterium avium subspecies paratuberculosis (Johne’s disease). Characterization of CCL19 in cattle provides valuable insight into CCR7-mediated immune cell trafficking and adaptive immune regulation in livestock health and disease.