The 10 Greatest American Plays?

These are just a few of my favorites, which tend to be a little different thing because the "greatest" plays tend to be what can be re-produced or re-staged. Some plays are odd like Bug is a very great written play that imo can't be staged well (not the film either), so its stuck in some weird in-between world.

Your list pretty much nails it for the big plays - I do think August Osage County and How I Learned to Drive are modern plays that will start appearing on the list more as the years go by.

True West, by Sam Shepard
American Buffalo, by David Mamet
Glengarry Glen Ross, by David Mamet
The Zoo Story, by Edward Albee
Orphans, by Lyle Kessler

One can write a list just featuring Tennessee Williams, Arthur Miller and Eugene O’Neill, so I’ll limit my list to one play per person.

Angels in America (Tony Kushner)
A Raisin in the Sun (Lorraine Hansberry)
A Streetcar Named Desire (Tennessee Williams)
The Crucible (Arthur Miller)
August: Osage County (Tracy Letts)
Fences (August Wilson)
The Iceman Cometh (Eugene O’Neill)
Glengarry Glen Ross (David Mamet)
True West (Sam Shepard)
Who’s Afraid of Virginia Woolf? (Edward Albee) *

I hate Edward Albee, but I suppose Who’s Afraid of Virginia Woolf? is undeniably important.