Empyema thoracis refers to the accumulation of pus in the pleural space in children, usually as a complication of pneumonia. It is most commonly caused by bacterial infections, with *Streptococcus pneumoniae*, *Staphylococcus aureus*, and *Haemophilus influenzae* being frequent culprits. The condition typically progresses through three stages: exudative, fibrinopurulent, and organizing. Clinically, affected children may present with fever, cough, chest pain, and respiratory distress. Diagnosis is supported by imaging, particularly chest X-ray and ultrasound, while pleural fluid analysis confirms the diagnosis. Management involves antibiotics and, in many cases, drainage of the pleural collection via chest tube or surgical intervention. Early recognition and appropriate treatment are critical to prevent long-term complications and ensure recovery.