This thesis is concerned with the question of what wellbeing consists in, and how well Epicureanism answers that question. In the first part, I compare some modern approaches to wellbeing: desire-satisfaction, objective-list theories, and hedonism. I reject the objective-list approach and accept that desire-satisfactionism is an accurate and useful account of what wellbeing is. However, desire-satisfaction is not basic and can be reduced to hedonism, which is what wellbeing actually consists in. I then reject attitudinal hedonism in favour of a sensational-pleasure definition. In the second part, I turn to Epicureanism in an attempt to solve some the difficulties that arise from modern hedonistic theories. I set out the main components of...