H33

H33 may refer to:
 * H-33 (Michigan county highway)
 * Bell H-33, an experimental American tiltrotor aircraft
 * Hanriot H.33, a French biplane
 * Highway H33 (Ukraine)
 * HMS H33, a Royal Navy H-class submarine
 * HMS Vanoc (H33), a Royal Navy V-class destroyer
 * Retinal detachment