The Departed also picked up a Best Director accolade for Scorsese and a Best Film Editing nod for Thelma Schoonmaker.
Elsewhere, Helen Mirren was named Best Actress for her turn in The Queen, while Best Actor went to Forest Whitaker for The Last King of Scotland.
Peter O'Toole was honoured with the William Holden Lifetime Achievement Award.
The Las Vegas Film Society is made up of 12 local critics who work for various print, radio, TV and Internet publications.
The full list of winners is:
Best Picture--The Departed
Best Actor--Forest Whitaker in The Last King of Scotland
Best Actress--Helen Mirren in The Queen
Best Supporting Actor--Djimon Hounsou in Blood Diamond
Best Supporting Actress--Jennifer Hudson in Dreamgirls
Best Director--Martin Scorsese for The Departed
Best Screenplay (Original or Adapted)--Jason Reitman for Thank You for Smoking
Best Cinematography--Emmanuel Lubezki for Children of Men
Best Film Editing--Thelma Schoonmaker for The Departed
Best Score--Thomas Newman for The Good German
Best Song--“Ordinary Miracle” by David Stewart and Glen Ballard; “Charlotte's Web” by Sarah McLachlan
Best Family Film--Charlotte's Web
Best Documentary--An Inconvenient Truth
Best Animated Film--Monster House
Best Foreign Film--Pan's Labyrinth
Best Costume Design--Marie Antoinette
Best Art Direction--Marie Antoinette
Best Visual Effects--X-Men: The Last Stand
Best Youth in Film--Abigail Breslin in Little Miss Sunshine
Best DVD (Packaging, Design and Content)--Superman Ultimate Collector’s Edition (Warner Home Entertainment)
William Holden Lifetime Achievement Award--Peter O'Toole
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