Happiness is a challenging, multifaceted topic, which obviously calls for an interdisciplinary approach. This work is a collection of papers which explores the phenomenon of happiness from a variety of angles, and from both theoretical and practical perspectives. They deal with the general nature and conditions of happiness, methods and measures for studying happiness, the consequences of happiness policies and discourses and the significance of specific factors, like landscapes or educational environments, for happiness. Some of the papers investigate the thoughts of ancient, 19th-century or 20th-century philosophers. Others employ theories and techniques from contemporary psychology to get a firmer grip on the elusive phenomenon of happiness.Contributors include Ranjeeta Basu, Valeriu Budeanu, Sarah A. Bushey, Mustafa Cihan Camci, Emily Corrigan-Kavanagh, Carolina Escobar-Tello, Julia Hotz, Søren Harnow Klausen, Kathy Pui Ying Lo, Andrea-Mariana Marian, Bryon Martin, Andrew Molas, Sean Moran, Liza Ortiz, Shelomi Panditharatne, Sheila M. Rucki, Jane Russel-O’Connor and Marie Thomas.