Who is the founder of Boy Scouts?

Lord Baden-Powell
The question reads who is the founder of the boy scout movement. Since Boy Scouts was started first in England, I will give the answer as it relates to Boy Scouts in England.

Lord Robert Baden Powell, or BP. His full name is Robert Stephenson Smyth Baden-Powell.

Very Correct, additionally the BSA was founded by

William D. Boyce

Ernest Thompson Seton

Daniel Carter Beard