My favorites:
George Romero
John Carpenter
Tobe Hooper
David Cronenberg
David Lynch
Peter Jackson
Sam Raimi
Dario Argento
Lucio Fulci
Ruggero Deodato
Umberto Lenzi
Joe D'Amato
John Waters
Darren Aronofsky
Olaf Ittenbach
Andreas Schnaas
Jorg Buttgereit
Jim VanBebber
Gaspar Noe
Michael Haneke
Andrzej Zulawski
Alejandro Jodorowsky
Fernando Arrabal
Luis Bunuel
Ingmar Bergman
Shinya Tsukomoto
Takashi Miike
Richard Kern
Larry Clark
Harmony Korine
Gregg Araki
Lodge Kerrigan
Agusti Villaronga
Douglas Buck
Karim Hussain
Nacho Cerda
Fred Vogel
Ryan Nicholson
Ti West