A Scout leader or Scouter generally refers to the trained adult leader of a Scout unit. The terms used vary from country to country, over time, and with the type of unit.

Scouting, also known as the Scout Movement, is a worldwide youth social movement employing the Scout method, a program of informal education with an emphasis on practical outdoor activities, including camping, woodcraft, aquatics, hiking, backpacking, and sports. Another widely recognized movement characteristic is the Scout uniform, by intent hiding all differences of social standing in a country and encouraging equality, with neckerchief and campaign hat or comparable headwear. Distinctive uniform insignia include the fleur-de-lis and the trefoil, as well as merit badges and other patches.