A neuroscientist (or neurobiologist) is a scientist who has specialised knowledge in neuroscience, a branch of biology that deals with the physiology, biochemistry, psychology, anatomy and molecular biology of neurons, neural circuits, and glial cells and especially their behavioral, biological, and psychological aspect in health and disease.

Neuroscientists generally work as researchers within a college, university, government agency, or private industry setting. In research-oriented careers, neuroscientists typically spend their time designing and carrying out scientific experiments that contribute to the understanding of the nervous system and its function. They can engage in basic or applied research. Basic research seeks to add information to our current understanding of the nervous system, whereas applied research seeks to address a specific problem, such as developing a treatment for a neurological disorder. Biomedically-oriented neuroscientists typically engage in applied research. Neuroscientists also have a number of career opportunities outside the realm of research, including careers in industry, science writing, government program management, science advocacy, and education. These individuals most commonly hold doctorate degrees in the sciences, but may also hold a master's degree.