Politeness and impoliteness are not just expressed by words. People communicate polite and impolite attitudes towards each other through their intonation, tone of voice, their facial expressions, their gestures, the positioning of their bodies towards each other, and so on. This volume brings together eleven empirical studies that investigate these various modalities of im/politeness across signed, spoken and written languages, plus a detailed introductory chapter that establishes a framework for the multimodal investigation of im/politeness. The papers cover a range of languages and cultures, including Swiss German Sign Language, Catalan Sign Language, English (as a native language and as a lingua franca), Korean, Catalan, Persian, Japanese and Spanish. Using a range of data sources and state-of-the art methodologies, the papers reveal that these multimodal features are essential aspects of im/politeness across different languages, cultures and modes of interaction. Put together, the findings from these studies lay the groundwork for a new understanding of im/politeness which is fundamentally multimodal.