Being happy is associated not only with better health, higher earnings and a longer life, but also with a stable family upbringing, stable financial situation, employment, good health, freedom and personal values. Psychiatrists may increase their patients' happiness by promoting effective, evidence-based mental healthcare. Individuals may enhance their own happiness by optimising physical and mental health; recognising the importance of personal values and happy communities; and optimising their financial situation. Government may boost citizens' happiness by deepening democracy; providing effective healthcare; supporting evidence-based well-being initiatives in communities; and then leaving citizens to seek out personal happiness in their own way.