国家铁道模型协会（National Model Railroad Association，NMRA）是全世界最大的铁道模型非营利性组织，成立于1935年，总部位于美国威斯康辛州密尔瓦基。该组织宗旨在于提供广大铁道模型迷更多的服务。
英语百科
National Model Railroad Association 国家铁道模型协会
（重定向自NMRA）
The National Model Railroad Association (NMRA) is a non-profit organization for those involved in the hobby or business of model railroading. It was founded in the United States in 1935, and is also active in Canada, Australia, the United Kingdom, and the Netherlands. It was previously headquartered in Indianapolis, Indiana, and has been based in Chattanooga, Tennessee next to the Tennessee Valley Railroad Museum (TVRM) since 1982.