心理治疗（Psychotherapy）是由经过受过心理治疗专业训练并通过考核的人员，主要是心理师以及接受心理治疗训练的精神科医师。立一种独特的人际关系来协助患者（或称当事人、案主、个案）处理心理问题、减轻主观痛苦经验、医治精神疾病及促进心理健康、个人成长。心理治疗一般是基于心理治疗理论及相关实证研究（主要是咨询心理学、临床心理学和精神病学）而创建的治疗系统，以创建关系、对话、沟通、深度自我探索、行为改变等的技巧来达到治疗目标，例如改善受助者的心理健康或减轻精神疾病征状等。

Psychotherapy is the use of psychological methods, particularly when based on regular personal interaction, to help a person change and overcome problems in desired ways. Psychotherapy aims to increase each individual's well-being and mental health, to resolve or mitigate troublesome behaviors, beliefs, compulsions, thoughts, or emotions, and to improve relationships and social functioning. Certain psychotherapies are considered evidence-based for treating some diagnosed mental disorders.