The za (座 lit. 'seat' or 'pitch'?) were one of the primary types of trade guilds in feudal Japan.
They grew out of protective cooperation between merchants and temples and shrines; merchants would travel and transport goods in groups, for protection from bandits and the vacillating whims of samurai and daimyo (feudal lords). They would also enter into arrangements with temples and shrines to sell their goods on a pitch or platform in the temple's (or shrine's) grounds, placing themselves under the auspices and protection of the temple or shrine. The word za, meaning seat, pitch, or platform, was thus applied to the guilds. The name may have also come, more simply, from the idea of merchants within a guild or association sharing a seat or platform in the marketplace.
The earliest za came into being in the 12th century, consisting not only of trade guilds, but also guilds of performers and entertainers. Even today, performers of kabuki and noh are in associations called za (see Kabuki-za). The za trade guilds appeared as a major force in the 14th century, and lasted in their original forms through the end of the 16th, when other guilds and trade organizations arose and subsumed the za. While no longer powerful in their original forms, it could be argued that the basic concept of the za, and most likely the same merchants running them, continued to exist as powerful agents in the market through to the 18th, going through many organizational and structural changes over the centuries, and eventually being eclipsed by other organizations like the ie trading houses. Though very powerful at times, and enjoying certain tax exemptions and other formal governmental benefits, it is important to note that the za, at least in their original forms, were never as official or organized as the medieval guilds of Europe.