I have 27 Fassbinder films which is only just over half his output.
I think technically I have more Almodovar since at 17 I have all of his feature movies.
13 Dario Argento.
19 Russ Meyer films.
13 Fellini.
2 Vincent Gallo :P.

yeah...but...now we have BD as well..so....it's only a miracle that I saw this considering my DVD thread time has GREATLY lessened in comparison to the HD thread which has increased a lot more every day.

Body Bags
Elvis
Someone's Watching Me

No idea since DVDSpot died, but maybe Bergman.

Don't think I've ever counted but I believe my highest are:

Dario Argento: 15
Takashi Miike: 18
Russ Meyer: 19

51 directed by Chang Cheh.

hmm. not sure on stats on most films, but these are the directors I enjoy the most and probably have the most representation in my collection.

Fritz Lang (my fav- at least 14)
Billy Wilder
Michael Curtiz
Howard Hawks
Alfred Hitchcock
John Houston
Peter Jackson (though I have no interest in Lovely Bones)
Sammo Hung
Joseph Manckiewiecz
Wolfgang Peterson (until his last few films)
Tsui Hark (I include him as director and producer)
Renny Harlin (I unashamedly love this guy's work!)
Yuen Woo Ping (too many to count!)
Preston Sturges
Johnny To (at least 14 for him)

Oliver Stone
Martin Scorsese
Peter Weir

5 DVDs or more:

John Carpenter - 14
Steven Spielberg - 14
Sam Raimi - 11
Richard Donner - 9
Kevin Smith - 9
Joel & Ethan Coen - 8
John Hughes - 8
Rob Reiner - 8
Quentin Tarantino - 7
Robert Zemeckis - 7
Don Coscarelli - 6
Wes Craven - 6
David Cronenberg - 6
Clint Eastwood - 6
Alfred Hitchcock - 6
Peter Jackson - 6
Stanley Kubrick - 6
Robert Rodriguez - 6
George Romero - 6
Wes Anderson - 5
Tim Burton - 5
Francis Ford Coppola - 5
Roger Corman - 5
David Fincher - 5
John Glen - 5
John Landis - 5
Sergio Leone - 5
Richard Linklater - 5
George Lucas - 5
Martin Scorsese - 5

I'm too lazt to check.... most likely Carpenter, Spielberg, De Palma, Lynch and Cronenberg are tops.

Never counted, but I'm sure its Hitchcock.

My top 10:

Ford - 42
Hitchcock - 38
Allen - 21
Bergman - 19
Meyer - 19
Altman - 18
Scorsese - 18
Ozu - 16
Sirk, Fuller, Fellini - 15

EDIT: Forgot Billy Wilder, with 17!

Probably Hitchcock.

Is there a way to sort by director on DVD Profiler?

Wes Craven, I have every one of his films available on DVD (except for Deadly Blessing, which is only available in region 4, I think)

According to DVDPedia:

Wes Craven - 18
George A. Romero - 10
Kevin Smith - 9
Sam Raimi - 8
John Carpenter - 7
Richard Donner - 6
Steven Spielberg - 6 (however it's counting the Indiana Jones movies (first 3) as 1, so really it's 8)

Not sure,but probably Kevin Smith.
-3 releases of Clerks(the Miramax Collector's Series{because of the exclusive Deleted Scene Intros},Clerks. X,and Clerks 15th BD)
-2 releases of Mallrats(the Universal Collector's Edition and Mallrats 10th)
-2 releases of Chasing Amy(Criterion DVD & Miramax BD)
-1 release of Dogma(2-Disc Special Edition)
-1 release of Clerks the Animated Series
-1 release of Jay & Silent Bob Strike Back(2-Disc DVD)
-1 release of Jersey Girl
-2 releases of Clerks II(2-Disc Special Edition with Suncoast Exclusive Bonus Disc,and the still sealed Best Buy Exclusive Mooby's Happy Meal Collector's Set)
-1 Release of Zack & Miri Make a Porno(2 Disc DVD)

Thats 8 films and an animated series,spread across 14 DVD or Blu-Ray releases. But now that I think of it I own quite a few Spielbergs,and another director like Smith that has multiple releases of the same films in Sam Raimi(Evil Dead Trilogy,Spider-Man Trilogy,and Drag Me To Hell).

After thoroughly going through my collection I have to add:
Stanley Kubrick
Alfred Hitchcock

Herzog 17
Stone 16
Allen 15
Friedkin 12
Kubrick 12
Scorsese 12

John Ford - Whatever's in Ford at Fox
Kurosawa - 16, with 4 more on pre-order

A few other directors I have 5+ of, such as Leone, Kubrick, Spielberg.

I just ordered the OOP Paradine Case, so that's 39 Hitchcocks, or all of his output currently on non-PD DVD.

I think it's Steven Spielberg with 15.

Steven Spielberg – 28
Jean Luc Godard – 12
Wong Kar Wai – 9
Spike Lee – 5
Kim Ki-duk – 5
Robert Altman – 5
Wes Craven – 8
Otto Preminger – 6
Chris Columbus – 6
Alfred Hitchcock – 19
Woody Allen – 31
Martin Scorsese – 16
Pedro Almodovar – 7
Christopher Guest- 5
Luc Besson – 7
Yasujiro Ozu - 9
Ingmar Bergman – 17
Eric Rohmer- 9
Robert Zemeckis – 14
Akira Kurosawa – 17
Stanley Kubrick – 12
Danny Boyle – 6
Francois Truffaut – 19
Guillermo Del Toro – 7
Coen Brothers – 8
David Lynch – 11
Michael Moore – 5
David Lean – 5
Takeshi Kitano – 5
Carlos Saura – 6
Hideo Nakata – 6
John Carpenter – 13
Jim Jarmusch – 5
Peter Weir – 5
David Cronenberg – 7
Gus Van Sant – 10
Ang Lee – 5
Sam Raimi – 13
Federico Fellini – 8
Clint Eastwood – 13
Werner Herzog – 19
Tom Tykwer – 7
Peter Jackson – 7
Brian De Palma – 8
Terry Gilliam – 7
Quentin Tarantino – 9
Kevin Smith – 7
Ridley Scott – 6
Giuseppe Tornatore – 5
Steven Soderbergh – 11
Alfonso Cuaron – 5
Zhang Yimou – 10
Hayao Miyazaki – 9
Satoshi Kon – 5
Don Bluth – 8
M. Night Shyamalan – 7
Richard Donner – 5
David Fincher – 5
Robert Rodriguez – 13
Tim Burton – 9
Jack Bender – 12 (He should count – Best TV director ever!)

I didn't sort it. That already took me long enough to add up...

-Tim Burton: 7 (8 if I include "Nightmare Before Christmas". I know he didn't direct it, but I still consider it a Burton film nonetheless)

-John Carpenter: 5

-James Cameron: 4