The Scout Motto of the Scout movement is, in English, "Be Prepared", with most international branches of the group using a close translation of that phrase. These mottoes have been used by millions of Scouts around the world since 1907. Most of the member organizations of the World Association of Girl Guides and Girl Scouts (WAGGGS) share the same mottoes.

In the first part of Scouting for Boys, Robert Baden-Powell explains the meaning of the phrase:

The scouts' motto is founded on my initials, it is:

BE PREPARED,

which means, you are always in a state of readiness in mind and body to do your DUTY;

Be Prepared in Mind by having disciplined yourself to be obedient to every order, and also by having thought out beforehand any accident or situation that might occur, so that you know the right thing to do at the right moment, and are willing to do it.

Be Prepared in Body by making yourself strong and active and able to do the right thing at the right moment, and do it.

— Lieut. Gen. Baden Powell C.B., Scouting for Boys (1908), "Camp Fire Yarn.—No. 4. Scout Law." (Part I, p. 48)