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In sumo wrestling, a heya (部屋, lit. "room"; here as sumō-beya, usually translated into English as stable or training quarters) is an organization of sumo wrestlers where they train and live. All wrestlers in professional sumo must belong to one. There are currently 43 heya (as of November 2013), all but four of which belong to one of five ichimon (groupings of heya). They vary in size, with the largest heya having over thirty wrestlers and smallest just two. Most heya are based in and around the Ryōgoku district of Tokyo, sumo's traditional heartland, although the high price of land has led to some newer heya being built in other parts of Tokyo or its suburbs.
Most heya have a network of scouts, who may be former wrestlers themselves, friends of the head coach, or supporters of the heya, who keep a look out for any powerful or athletic young men and follow the results of local sumo (and judo) competitions. Most new recruits join at the age of 15 or 16, straight from junior high school.
A wrestler is expected to stay with the heya he joins until the end of his career. There is no transfer system in sumo. The only exception is if the coach who originally scouted him leaves to found a new heya, in which case he might be permitted to follow him. If a heya shuts down due to retirement or death of the stablemaster, mismanagement or financial reasons, the remaining wrestlers might be permitted to transfer to another heya, usually within the same ichimon.
Heya may only be set up by an oyakata or elder of the Japan Sumo Association. A heya is always named after its founding oyakata. Further oyakata may be attached to the stable. In September 2006 the Sumo Association tightened the rules on opening up new stables. Now only oyakata who spent at least 25 tournaments ranked in san'yaku or 60 tournaments in the top makuuchi division may do so. The criteria for inheriting an existing heya are much less strict – the former Kanechika, for example was able to take over Miyagino stable despite having never fought in the top division at all, as only 12 makuuchi or 20 jūryō basho are needed.
A special rule dictates that wrestlers from the same heya never fight each other in a main tournament, except in playoffs for a yūshō or divisional championship. This notably worked to the advantages of brothers Takanohana and Wakanohana in recent years, as although they both achieved the top rank of yokozuna, they never had to fight each other (one playoff bout in 1995 excepted) as they both belonged to Futagoyama-beya.
- List of sumo stables - a list of active heyas.