Since the publication of Scouting for Boys in 1908, all Scouts and Guides around the world have taken a Scout (or Guide) promise or oath to live up to ideals of the movement, and subscribed to a Scout Law. The wording of the Scout Promise (or Oath) and Scout Law have varied slightly over time and from country to country. Some national organization promises are given below. Although most Scouting and Guiding organizations use the word 'promise', a few such as the Boy Scouts of America tend to use 'oath' instead. Typically, Scouts and Guides will make the three-fingered Scout Sign when reciting the promise.

In his original book on boy scouting, Baden-Powell introduced the Scout Promise, as follows:

<poem>Before he becomes a scout, a boy must take the scout's oath, thus: On my honour I promise that---

The form of the promise has varied slightly from country to country and over time, but must fulfill the requirements of the World Organization of the Scout Movement (WOSM) to qualify a National Scout Organization for membership. Together with clarifying its Scout Law, the Constitution of WOSM states: