A historian is a person who studies and writes about the past and is regarded as an authority on it. Historians are concerned with the continuous, methodical narrative and research of past events as relating to the human race; as well as the study of all history in time. Some historians are recognized by publications or training and experience. "Historian" became a professional occupation in the late nineteenth century as research universities were emerging in Germany and elsewhere.

इतिहासावर संशोधन करून वेळ, काळ, स्थळ इत्यादी बाबी जमेस धरून घडलेल्या घटना तपशीलवार नमूद करणारी व्यक्ती इतिहासकार म्हणून ओळखली जाते.