Allen, who shares playwright credit on Broadway's Relatively Speaking, was awarded Best Original Screenplay for his work on "Midnight in Paris."
Shannon (Ambassador) and Chastain (Othello at the Public), who were both featured in "Take Shelter," were awarded Best Actor and Best Supporting Actress, respectively. Castain also received the Robert R. "Bobby" McCurdy Memorial Breakthrough Artist Award.
Other notable winners include "Hugo," which features a screenplay by Red playwright John Logan, as Best Film; Nicolas Winding Refn as Best Director for "Drive"; Tilda Swinton as Best Actress for "We Need to Talk About Kevin"; and Albert Brooks as Best Supporting Actor for "Drive."
The AFCA is a group dedicated to supporting the best in film, whether at the international, national or local level.
For more information and a complete list of winners, visit austinfilmcritics.org.