दुर्व्यवहार (abuse) किसी शक्ति या अधिकार के अन्यायपूर्ण या अनौचित्यपूर्ण प्रयोग से किसी अन्य व्यक्ति, समूह, प्राणी, जीव या अन्य चीज़ के साथ करे गये बुरे या हानिकारक व्यवहार को कहते हैं। दुर्व्यवहार की बहुत-सी श्रेणियाँ न्याय-विधि द्वारा वर्णित होती हैं। दुर्व्यवहार कई प्रकार के होते हैं।

Abuse is the improper usage or treatment of a person or thing, often to unfairly or improperly gain benefit. Abuse can come in many forms, such as: physical or verbal maltreatment, injury, assault, violation, rape, unjust practices, crimes, or other types of aggression. To these descriptions, one can also add the Kantian notion of the wrongness of using another human being as means to an end rather than as ends in themselves. Some sources describe abuse as "socially constructed", which means there may be more or less recognition of the suffering of a victim at different times and societies.