医学信息学,或称卫生信息学或医学信息学, 是信息科学,医学和卫生保健学等学科的交叉学科. 它研究相关资源,设计和方法,以优化卫生和生物医学信息的获取,存储,检索和利用. 医学信息学工具不仅包含计算机,而且包括临床指导原则,医疗术语和信息通讯系统.

医学信息学的子领域包括: 临床信息学, 护理信息学,医学图形信息学,顾客健康信息学,公共卫生信息学,口腔医学信息学,临床研究信息学,生物信息学和药物信息学.

Health informatics (also called health care informatics, healthcare informatics, medical informatics, nursing informatics, clinical informatics, or biomedical informatics) is informatics in health care. It is a multidisciplinary field that uses health information technology (HIT) to improve health care via any combination of higher quality, higher efficiency (spurring lower cost and thus greater availability), and new opportunities. The disciplines involved include information science, computer science, social science, behavioral science, management science, and others. The NLM defines health informatics as "the interdisciplinary study of the design, development, adoption and application of IT-based innovations in healthcare services delivery, management and planning." It deals with the resources, devices, and methods required to optimize the acquisition, storage, retrieval, and use of information in health and biomedicine. Health informatics tools include amongst others computers, clinical guidelines, formal medical terminologies, and information and communication systems. It is applied to the areas of nursing, clinical care, dentistry, pharmacy, public health, occupational therapy, physical therapy and (bio)medical research, and alternative medicine. All of which are designed to improve the overall of effectiveness of patient care delivery by ensuring that the data generated is of a high quality e.g. an mHealth based early warning scorecard.