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<i>Staphylococcus</i> species are widespread in poultry environments and can cause various infections, often when the host’s defences are compromised. This manuscript reports on a co-infection of chickens with <i>Staphylococcus lentus</i> and <i>Staphylococcus aureus</i> associated with an outbreak of arthritis, synovitis, and osteomyelitis in an organic broiler breeder flock in Austria. Clinically, the affected flock showed weakness, lethargy, lameness, and increased mortality. Post-mortem examinations identified purulent arthritis and femoral head necrosis. Bacteriological analysis using MALDI-TOF MS identified both <i>S. aureus</i> and <i>S. lentus</i> in the affected joints. Antibiotic resistance testing revealed significant resistance, particularly in <i>S. lentus</i>. Histological analysis showed severe inflammation and bacterial colonies in the joints. While <i>S. aureus</i> is a common pathogen in poultry, <i>S. lentus</i> is less frequently reported. This study emphasises the need for detailed bacterial characterisation in outbreaks to better understand the role of less common pathogens like <i>S. lentus</i>. Further research is necessary to elucidate the impact of <i>S. lentus</i> on poultry health and its role in causing arthritis and synovitis, highlighting the importance of comprehensive investigation in such outbreaks.