Trueperella pyogenes, previously known as Arcanobacterium pyogenes, is a Gram-positive, opportunistic pathogen known for causing diverse suppurative infections in livestock and, less commonly, in humans. This pathogen resides in the skin, oropharynx, and mucous membranes of various animal species, including cattle, swine, and small ruminants, which has a substantial economic impact on agriculture due to conditions like mastitis, pneumonia, liver abscesses, and metritis. In humans, T. pyogenes infections are rare and typically occur in individuals with occupational exposure to farm animals, presenting as zoonotic infections such as sepsis, endocarditis, and pneumonia. The pathogenicity of this bacterium is largely attributed to its virulence factors, such as pyolysin (PLO), collagen-binding proteins (Cbp), neuraminidases (NanH and NanP), fimbriae, and exoenzymes, which facilitate tissue colonisation, immune evasion, and host tissue destruction. Despite the bacterium’s significant impact on animal husbandry, the transmission cycle remains poorly understood. However, endogenous infections and environmental contamination are likely sources. Diagnostic methods for T. pyogenes infection include microscopy, in vitro culture, and molecular techniques. The antibiotic therapy typically is by beta-lactams, tetracyclines, and macrolides. However, emerging antimicrobial resistance is a growing concern. Preventive measures focus on sanitation and fly control, while vaccine development targeting virulence factors like pyolysin shows promise in reducing infection. The multifaceted nature of T. pyogenes as both a commensal and pathogenic organism underscores the need for effective diagnostic, treatment, and prevention strategies in veterinary and human health contexts.