The study aims to outline how ancient Greek sport contributed to the drawing of boundaries between groups and within groups. The first section discusses the distinctions between polis honoratiores and the common crowds (section I.1); be-tween the rich and the poor (I.2); between the coached and the uncoached (I.3); be-tween equestrians and other competitors (I.4); and between the celebrated victors and the silent majority (I.5–6). The second section addresses the distinctions between Ath-ens and other poleis (II.1); between men and women (II.2); between free men and the enslaved (II.3); and, finally, between Greeks and non-Greeks (II.4). Most, though not all, of the evidence on which the study draws is Athenian, as is almost invariably the case in studies of ancient Greek history, but the main points made should be broadly valid for most Greek poleis.