Abbey Theatre, Ireland.
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Absurdist Theatre. Theater of the Absurd. An overview.

Theatre of the Absurd
A reference entry from Tescali.com.
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Absurdist Playwrights.
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Alfred Jarry

Alfred Jarry
.
Alred Jarry. Liste des oeuvres.

Eugène Ionesco
.
Harold Pinter official site.
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Samuel Beckett

Actors, Actresses.  Starseeker
Searchable listing of famous actors and actresses.
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Actors and actresses: Celebrity Link
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Actors and actresses official web sites:
Performing Arts and Artists Worldwide.
.
The Actor Site
.
The Actors Studio. From TheatrGROUP, St. Louis.
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Explore Talent.com. Discover talent online. 
A talent community visited by agents, managers, casting directors & Industry insiders. Your profile gets matched and submitted to current casting & auditions. You then receive a call, an email & SMS if a casting director wants you.Explore Talent.com.

American theatre

American Association of Community Theatre
The American Association of Community Theatre (AACT) is the national voice of community theatre, representing the interests of its members and over 7,000 theatres across the U.S.
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American repertory theatre.
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American theaters.
Find theatres, Broadway shows and musicals.
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American Theater Web
Find theatres, musicals and Broadway shows.
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American Variety Stage. Vaudeville and popular entertainment.
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Broadway. Talkin' Broadway
On Broadway/off Broadway discussion, history, shows.
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California Repertory Company
The California Repertory Company is one of Long Beach's premiere performing arts organizations.
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History of American theater, Wikipedia entry.
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New York Library for the Performing Arts
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New York theatre

New York City Guide Magazine. Broadway theatre.
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Broadway Tickets
New York entertainment site with theater history, reviews, bio's and Broadway tickets information providing all the information needed for a great night out in the big city.
.
New York Times Theater section.
Reviews.

The Public Theater, New York.
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Steppenwolf Theatre Company
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Theatre Communications Group
Mission: to strengthen, nurture and promote the not-for-profit professional American theatre.
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Wikipedia entry on theatre in The United States.

Ancient Theatre Today
Didaskalia
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Ancient theatre web sites.
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Wikipedia entry on ancient Greek theatre.

Musical Theatre Audition.com

Australian Theatre
The history of Australian theatre online. Articles and an historical database of Australian names associated with the theatre in Australia.
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Australian Theatre
Theatre Australia, a portal for Australian theatre.
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Sydney Theatre Company

Awards

Critics Circle Drama Awards
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Laurence Olivier Awards
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ODP list of theatre awards.
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Tony Awards