The article is devoted to the autograph as a genre of natural writing speech. The object of researcher’s attention is presented by memorable inscriptions (signatures), handwritten by authors on fiction books. Texts-autographs are realized through natural written activity of a person, possess typical features peculiar to genres of natural written speech in general (according to N.B. Lebedeva’s classification). It allows to relate autograph to this particular type of genres. The leading genre-formative parameter of texts-autographs is their manuscript nature.