Respiratory diseases, or lung diseases, are pathological conditions affecting the organs and tissues that make gas exchange difficult in air-breathing animals. They include conditions of the respiratory tract including the trachea, bronchi, bronchioles, alveoli, pleurae, pleural cavity, the nerves and muscles of respiration. Respiratory diseases range from mild and self-limiting, such as the common cold, influenza, and pharyngitis to life-threatening diseases such as bacterial pneumonia, pulmonary embolism, tuberculosis, acute asthma, lung cancer, and severe acute respiratory syndromes, such as COVID-19. Respiratory diseases can be classified in many different ways, including by the organ or tissue involved, by the type and pattern of associated signs and symptoms, or by the cause of the disease.

श्वसन तंत्र के रोगों में फेफड़ों के रोग, श्वासनली के रोग सहित इस तंत्र के अन्य रोग शामिल हैं। श्वसन तंत्र के रोगों में स्वयंसीमित सर्दी-जुकाम से लेकर जीवाणुजन्य न्यूमोनिया जैसे घातक रोग हैं।