This paper studies whether disciplinary sanctions in European professional football differ systematically by player race. Using player-match data from UEFA Champions League and Europa League competitions, we show that Black players are more likely than otherwise comparable non-Black players to receive both yellow and red cards. In our preferred specification, the gap is about 1.2 percentage points for yellow cards and 0.18 percentage points for red cards. We find no meaningful difference in net fouls committed, suggesting that observable on-field conduct alone is unlikely to account for the sanctioning gap. We then examine whether this differential varies across contexts. Identity-related proximity between referee and player does not reveal a systematic pattern of heterogeneity, while the yellow-card gap is larger among Black players with conflict-related background, consistent with a possible behavioral channel. Additional results show that VAR and home advantage do not systematically reduce the gap. Overall, the paper documents a persistent sanctioning gap by player race in a highly regulated sporting environment. JEL Codes: D91; D72; Z20; Z13.