Expert witnesses are witnesses brought into court cases for the purpose of them sharing testimony. Expert witnesses are considered experts in their field, based on some level of education or professional experience. Examples of expert witnesses include physicians giving medical testimony, phychiatrists, or any other professional wherein their knowledge is unique, and explanation is needed before the court.

Expert witnesses are an important part of many trials, and can be recruited through services that are designed to help provide experts in all types of professions.