21 September
A list of events which occurred on the 21st of September.

William E. Snyder is born.

Peter Paul Eastman is born.

Henry Gibson is born.

Jerry Ayres is born.

Elza Bergeron is born.

John Grower is born.

Mary Mara is born.

Gregory Irwin and Serena Scott Thomas are born.

Seventh and final day of filming on . Production went one day over schedule.
First draft script for  is submitted titled "Court-martial on Starbase Eleven".

First day of filming on .
Second revised final draft script of  is revised again.

 airs.

Thirty-third day of filming on .

Autumn Reeser is born.

Walt Davis dies.

Twenty-seventh day of filming on .
Cassandra Rose Clarke is born.

Third day of filming on .

 airs.
Twenty-fourth day of filming on .

Second day of filming on .

Final day of filming on  and first day of filming on .
Twelveth day of filming on . 

First day of filming on .

First day of filming on .

Third day of filming on .

Eight day of filming on .
Final draft script of  is submitted.

Sixth day of filming on .

John Crawford dies.

Sixty-first day of filming on .

Arell Blanton dies.

Jack Donner, Aron Eisenberg, and Sid Haig die.

Willie Garson dies.

Unknown year
Vanessa Jackson is born. 

de:21. September
es:21 septiembre
it:21 settembre
nl:21 september
pt:21 de setembro
ru:21 сентября
sv:21 september