What do you call a biography written about oneself?

A biography written about oneself is called an autobiography. This form of narrative allows individuals to share their life story from their own perspective, detailing their experiences, thoughts, and reflections on their journey. An autobiography emphasizes the personal insights and specific events in the author’s life, providing a firsthand account that offers unique depth and understanding of their character and experiences.

In contrast, a biography is typically an account of someone else's life, written by another person. A memoir, while also a personal account, tends to focus on specific themes or periods of the author’s life rather than encompassing their entire life story. A diary is a more private form of writing that records daily events, thoughts, and feelings, and is not structured as a narrative of an individual's life in the same way an autobiography is. Therefore, the choice of "autobiography" is the most accurate term for a biography that someone writes about themselves.