  While sport has been practised since pre-historic times, it is a relatively new subject of systematic philosophical enquiry. Indeed, the philosophy of sport as an academic sub-field dates back only to the 1970s. Yet, in this short time, it has grown into a vibrant area of philosophical research that promises both to deepen our understanding of sport and to inform sports practice. Recent controversies at the elite and professional level have highlighted the ethical dimensions of sport in particular. Lance Armstrong’s use of performance-enhancing drugs raised new issues in the ethics of cheating, middle-distance runner Caster Semenya has challenged prevailing rules around sex classification in sport, and Oscar Pistorius’s prosthesis has problematized the distinction between able-bodied and disabled sport.  While philosophical analysis may help to achieve a deeper understanding of sport, such analysis may also illuminate problems of philosophy beyond sport, ranging from the nature of skill to the ethics of altruism.