This Element explores the connection between God and happiness, with happiness understood as a life of well-being or flourishing that goes well for the one living it. It provides a historical and contemporary survey of philosophical questions, theories, and debates about happiness, and it asks how they should be answered and evaluated from a theistic perspective. The central topics it covers are the nature of happiness (what is it?), the content of happiness (what are the constituents of a happy life?), the structure of happiness (is there a hierarchy of goods?), and the possibility of happiness (can we be happy?). It argues that God's existence has significant, positive, and desirable implications for human happiness.