Actors Alliance of San Diego

Asian American Repertory Theatre

Balboa Park Puppet Theatre

Broadway/San Diego

Common Ground Theatre

Coronado Playhouse

Cygnet Theatre Company

Christian Youth Theatre

Diversionary Theatre

Fritz Theatre

Ion Theatre Company

J*Company Youth Theatre

La Jolla Playhouse

Lamb's Players Theatre

Lynx Performance Theatre   

Mo`olelo Performing Arts Company

MOXIE Theatre

Moonlight Stage Productions
The real team players
New Village Arts Theatre

North Coast Repertory Theatre

North Park Vaudeville and Candy Shoppe

Old Globe Theatre

Playwrights Project

Poor Players Theatre Company

Poway Center for the Performing Arts Foundation

San Diego Guild of Puppetry/Puppetry Center

San Diego Repertory Theatre

SDSU School of Theatre, Television and Film

Scripps Ranch Theatre

6th@Penn Theatre

Sledgehammer Theatre

Starlight Theatre

Stone Soup Theatre Company

UCSD Theatre & Dance OnStage

Vantage Theatre

Welk Resort Theatre
The following is a list of links to the Web sites of select San Diego-area theater companies.
While it is by no means inclusive, it's comprehensive and handsomely reflects the county's
topography. As this site grows, so will the list.   
You need Java to see this applet.
And these sites do a pretty good job covering theater in other major cities.  
Showmag

Theatermania

Theatre Communications Group
American Theater Web

American Theatre magazine

American Theatre Wing
www.edarts.info