The5thInternationalWorkshoponHapticandAudioInteractionDesign(HAID) was held in September 2010 in Copenhagen, Denmark. Technologies to enable multimodal interaction are now mature to the point that researchis turning away from pure hardwaredevelopment, looking towards interaction and design issues to improve usability and the user experience. - bust solutions exist to display audio and haptic feedback in many forms, for instance as speech and non speech sounds and through tactile and force fe- back sensations. Furthermore, it has been demonstrated that the novel inter- tions supported by these modalities can provide bene?ts for all users. However, many questions remain concerning the appropriate use of haptics and audio in interaction design: how can we design e?ective haptic, audio, and multimodal interfaces? In what new application areas can we adopt these techniques? Are there design methods that are useful, or evaluation techniques that are parti- larly appropriate? HAID 2010 was a direct successor to the successful workshop series inau- rated in Glasgow in 2006, then held in Seoul in 2007, in Jyv. askyl. a in 2008, and in Dresden in 2009. The aim of HAID was to bring together researchers and practitioners who shared an interest in investigating how the haptic and audio modalitiescansynergizeinhumancomputerinteraction. Theresearchchallenges in the area are best approached through user-centred design, empirical studies, or the development of novel theoretical frameworks. A total of 21 papers were accepted for HAID 2010, each containing novel work on these human-centric topics.