Yes,

Ed Barrow 1903-1920, started w/ Tigers
Hugo Bezdek 1917-1919, Pirates
Judge Fuchs 1929
Ted Turner 1977, 1 game for Braves
John Boles 1996-2001, Marlins
Carlos Tosca 2002-2004, Blue jays

Yes!

yes there has been.

Of course there has!!!!!!!!!!!!!!!

Dave Trembley, the current Orioles manager, never played professional ball.

You would be hard-pressed to find a manager who'd never played at any level - most who never made the majors at least played in the minor leagues. Of current managers, Jim Leyland of the Tigers, Fredi Gonz谩lez of the Marlins, Grady Little of the Dodgers, Manny Acta of the Nationals and Joe Maddon of the Devil Rays never played in the majors, though all were minor league players.

Historically, the only one I can think of who never even played in the minors is Hugo Bezdek, who managed the Pirates from 1917-19. There are probably others, though.