This article explores the various factors that make a city happy in Japan and examines the happiest cities in Japan according to both OECD surveys and surveys from Japanese citizens. Tokyo is considered one of the top five happiest cities in Japan with an average score of 8 out of 10 for overall life satisfaction among its citizens, along with Osaka, Yokohama, Nagoya and Sapporo. Factors for a city's happiness include economic wellbeing, safety, education, healthcare, leisure activities, public transportation, environment, housing affordability and access to cultural attractions. The article also discusses what makes Tokyo the happiest city in Japan and other notable cities for happiness and quality of life. Finally, it looks at how to make any city in Japan more happy.