Shaquille O'Neal -- Just Call Him THE BIG DIRECTOR

Shaquille O'Neal is giving the movie biz another shot -- yes, even after "Kazaam" and "Steel" -- and this time he wants to be a director!

Shaq is about to complete the Filmmaking Conservatory at the New York Film Academy's branch at Universal Studios Hollywood. Shaq's been very hands-on during directing and cinematography classes -- walking his crew through stunts (above photo) ... and shooting on the studio's famous back lot (see the video below).

According to the school, Shaq has been "incredibly humble, funny, and likable" ... or just the usual Shaq.

How big do they make those director's chairs anyway?