As one of the most important teaching aids, the textbook plays a key role in language teaching and learning processes. In the present work, we have carried out an in-depth study of the Français (1) textbook, the French textbook designed to teach French to middle-school students in Iran, in order to examine how to adapt and contextualize the FLE textbook for Iranian teenagers. To this end, we surveyed Iranian teachers and students in order to understand their needs and objectives in learning French. In addition, we examined the Adosphère manual (1), developed for teenagers in France, and the Bien dit ! (1), aimed at teenagers in the USA, with the aim of verifying how and to what extent the designers of these manuals have attempted to take advantage of contemporary approaches to the didactics of languages and cultures, and to what extent these manuals are adapted to the context of teaching and learning French, as well as to the needs, objectives and characteristics of the teenage public in each country.