Palaeography (UK) or paleography (US) (ultimately from Ancient Greek: παλαιός, palaiós, 'old', and γράφειν, gráphein, 'to write') is the study and academic discipline of historical writing systems. It encompasses the historicity of manuscripts and texts, subsuming deciphering and dating of historical manuscripts, as well as the analysis of historic penmanship, handwriting scripts, signification, and printed media.
It is primarily concerned with the forms, processes, and relationships of writing and printing systems as evident in a text, document, or manuscript — analysis of the substantive textual content of documents is a secondary function. Included in the discipline is the practice of deciphering, reading, and dating manuscripts, and the cultural and technical context of writing systems, including the methods by which texts (such as manuscripts, books, codices, tracts, and monographs) were produced, and the history of scriptoria. Palaeography as a discipline is important for understanding, authenticating, and dating historical texts; however, in the absence of additional evidence, it is difficult to use palaeographic means alone to pinpoint exact dates of such texts.