This two-day workshop will bring together an interdisciplinary group of researchers, designers and practitioners who are working on or are interested in the topic of wellbeing in the field of interaction design. Wellbeing is defined as positive mental health, and therefore not only the absence of mental illness, but also the presence of positive psychological functioning. The workshop will provide a platform to share resources, create new ideas for design and build valuable future collaborations. During the first day participants will present their work and exchange their knowledge and experiences in the field. The workshop will utilize a series of interactive activities to support participants in collaboratively constructing a shared understanding of the concept of wellbeing, its contributing factors as well as its challenges in terms of design. On the second day participants will be invited to create low-fidelity prototypes that support an aspect of wellbeing using Gadgeteer and other prototyping materials. These practical activities will stimulate discussion so as to contribute to a better understanding of how wellbeing can be facilitated through design, whilst also addressing evaluation challenges and illustrating related ethical questions.