The death of Mary Grace Canfield today got me thinking about the excellence of "Green Acres"' supporting cast. Eb, Mr. Haney, the Ziffels, etc. seemed to get all they could out of their roles, and I don't remember a single cast member who was a weak spot. What supporting cast stands out for you as full of talent and depth.

Without a doubt the supporting cast of Frasier all fit in well and were funny. Niles, Daphne, Mr. Crane, Roz, Bulldog etc all great.

The Dick Van Dyke Show! Morey Amsterdam, Rose Marie, Richard Deacon, Carl Reiner, Ann Morgan Guilbert, and Jerry Paris were all great actors, all perfectly cast in their roles, and allowed Dick and Mary to shine as the leads. Even Larry Matthews who played their son was well cast as a typical american kid.

Shows IMO with the best ensemble casts:

Frasier
Cheers
Martin
Living Single
I Love Lucy
Seinfeld
Friends
Married With Children
The Cosby Show
The Golden Girls
Roc

This is why 2 Broke Girls is awful, the leads are likeable enough but they have to do all of the heavy lifting. One of the most useless supporting casts I've ever seen. The creepy russian, the creepy asian kid and garret morris all add nothingl, waste of space. They added Stifler's mom and she's a funny comedienne.

Back to topic....
Frasier
NewsRadio
Seinfeld

I think Bewitched owns this category. Samantha and Darrin (at least Dick York) are great leads, but it's the supporting cast that made the show long-lasting and interesting. Endora, Larry Tate, Gladys and Abner Kravitz, Aunt Clara, Uncle Arthur, Tabitha, Dr. Bombay, Serena, Mr. and Mrs. Stephens, etc. all took the show in different directions each week. The leads were great, but with no real supporting cast, it becomes...well, I Dream Of Jeannie!

best casting choices:
I love Lucy
the honey mooners
family ties
boy meets world
the wonder years
Sanford and son
the dick van dyke show
quantum leap
the odd couple
Frasier
saved by the bell
welcome back ,kottoer
family matters
step by step
my two dads
the Jefferson's
I dream of jennies
bewitched
batman
Adventures of Superman
wonder women
The Incredible Hulk

The Mary Tyler Moore Shows stands above all others for me in this category.

But some others that are worth mentioning:
Bob Newhart Show
Andy Griffith Show
Cheers
The Office
Newsradio
Parks & Recreation

I'd also like to add "Gimmie a Break" on here. The supportive cast featured Thelma Hopkins, John Hoyt, and Joey Lawrence.

I'd also say "All in the Family" since that show had two successful spin-offs with "Maude" and "The Jeffersons". "Happy Days" was like that too with "Laverne and Shirley" and "Mork and Mindy".

The Mary Tyler Moore Shows stands above all others for me in this category.

But some others that are worth mentioning:
Bob Newhart Show
Andy Griffith Show
Cheers
The Office
Newsradio
Parks & Recreation

I think also that Barney Miller fits.

Some of my favorite ensemble casts:

Mama's Family
Green Acres
The Golden Girls
Designing Women
The Facts of Life
Desperate Housewives
3rd Rock from the Sun
Will & Grace
Murphy Brown
Newhart
The Wonder Years
The Addams Family
The Andy Griffith Show
Leave It to Beaver
NewsRadio
All in the Family
The Jeffersons
Boy Meets World
Step by Step
Buffy the Vampire Slayer
Cheers
Ellen
Gilligan's Island
I Love Lucy
In the Heat of the Night
Night Court
Roseanne

The Mary Tyler Moore Shows stands above all others for me in this category.

But some others that are worth mentioning:
Bob Newhart Show
Andy Griffith Show
Cheers
The Office
Newsradio
Parks & Recreation
I agree that The Mary Tyler Moore Show stands above.