A guildhall is either a town hall, or a building historically used by guilds for meetings and other purposes, in which sense it can also be spelled as "guild hall" and may also be called a "guild house". It is also the official or colloquial name for many of these specific buildings, many of which are now museums.
In the United Kingdom, outwith Scotland, a guildhall is usually a town hall: in the vast majority of cases, the guildhalls have never served as the meeting place of any specific guild. A suggested etymology is from the Anglo Saxon "gild", or "payment"; the guildhall being where citizens came to pay their rates. For the Scottish municipal equivalent see Tolbooth.
The Low Countries used to have guildhalls in every city, often one gildenhuis (Dutch, literally "guild house") for each trade. They were often elaborate, ornate buildings, demonstrating the guild's status. Occasionally a single hall would be used by all the city's guilds.
The guildhall was used as the offices of the deken (deacon) and other guild officers, and for meetings by the overlieden (board of directors). The guild members would occasionally be called to the guildhall for meetings on important matters.
In Amsterdam, every guildhall had its gildeknecht (guild servant), often the guild's youngest member, and was guarded by a gildehond (guild dog). Every evening, the guild brothers gathered in the tavern room of the guildhall to discuss the events of the day while the gildeknecht served beer. Once a year, the guildmen would gather in the guildhall for a communal meal.
The guildhall of the merchants' guild also served as de facto commodity market. Therefore, there was no need in the Middle Ages for a separate building for this purpose.
In the Low Countries, each guildhall was marked by the coat of arms of that guild, hanging from the facade of the building. Occasionally, the coat of arms was replaced with a gable stone depicting a member of the guild, surrounded by the tools of his trade.