How do we affirm that Foucault does Philosophy? Which kind of philosophy is it and how is it set? Permeated for questions like these, this work defends the thesis that Foucault does philosophy by fictions. A wide term, it suggests a non-traditional relationship the author estabilishes with the practice of history of philosophy. The reason is his treatment of philosophical thematics and questions linked with a different understanding about history, as well his other approach to the traditional aim of philosophy – the truth –, as we hope to show by choicing to talk about fictions. Thanks to a particular reading of two methodological points of view - Kant s critical project and Nietzschean genealogical approach, Foucault drafts innovator strategies to comprehend the way in which truths shapes subjectivities. Taking it in account, we put lights (and shadows?) in a new way of writting the history which implies a different way of thinking philosophy, once one of his most continuos interests would be inquiry the games of truth. After essaying many of his fictions – from his encyclopedias to his way to comprehend the Antiquity, passing through many characters and perspectives about philosophy -, we hope to stress certain freedom and liberation of thought into his books, writtings and speechs, facing traps and stalemates naturalized by traditional pratices, as well as challenging the common-sense of Foucault s readings.