A Gyōji (行司) is a referee in professional sumo wrestling in Japan.
Gyōji usually enter the sumo world as teenagers and remain employees of the Sumo Association until they retire aged 65. There are currently a little over 40 active gyōji with an average of one in each sumo stable, though some stables have more than one and some have no gyōji.
The gyōji's principal and most obvious task is to referee bouts between two sumo wrestlers. After the yobidashi has called them into the ring it is his responsibility to watch over the wrestlers as they go through the initial prebout staring contests, and then coordinate the initial charge (or tachi-ai) between the wrestlers. He will indicate that the preparation time (four minutes for the top division) is up by saying "jikan desu, ryote wo tsuite" ("it's time, both hands down") and signal with his fan that the bout is to begin (although it is the wrestlers that ultimately determine the exact point at which the tachi-ai is initiated). He will sometimes add, "kamaete mattanashi!" ("on your marks, no false starts!") During the bout, he is supposed to keep the wrestlers informed that the bout is still live (it is possible for a wrestler to brush his foot outside the ring without realising it). He does this by shouting "nokotta nokotta!" (残った、残った!), roughly translated means: "You're still in it! You're still in it!" The gyōji also has the responsibility to encourage the wrestlers to get a move on when action between them has completely stopped, for instance, when both of them are locked up on each other's mawashi in the middle of the ring. He will do this by shouting "hakkeyoi, eh! hakkeyoi, eh!" (発気揚々, 発気揚々!). Furthermore, when a wrestler has apparently fallen to the clay, the gyōji is expected to determine the winner of the bout. His most obvious accessory is a solid wooden war-fan, called a gunbai which he uses in the prebout ritual and in pointing to the winner's side at the end of each bout.
The gyōji's decision as to the winner of the bout can be called into question by one of the five judges who sit around the ring. If they dispute the result they hold a mono-ii (lit: a talk about things) in the centre of the ring, aided through an earpiece to a further two judges in a video room. They can confirm the decision of the gyōji, overturn it, or order a rematch. The gyōji is not expected to take part in the discussion during a mono-ii unless asked to do so. In many cases, a match may be too close to call, or the gyōji may not have managed to get a clear view of the end of the bout. Regardless, he is still obliged to make a split second decision as to his choice of "winner". This creates pressure for a gyōji, especially considering that a reversed decision is like a black mark: too many and it may affect his future career (such referees are never demoted; simply passed over for promotion).