In the days before 30 Rock celebrities made cameo appearances on America's greatest comedy institution, Saturday Night Live (and still do) but almost everyone from Al Gore to Moby to Whoopi Goldberg and more are making appearances on 30 Rock.

Here is a list of cameos on 30 Rock from the evident and well-known to the not so well-known, in no particular order of 30 Rock season appearance. All Cameos are as Himself/Herself unless otherwise written:

• James Carville (Secret and Lies: Season 2, Episode 8)
• Moby (Kidney Now! : Season 3, Episode 22)
• Al Gore (Greenzo: Season 2, Episode 5) and (Sun Tea: Season 4, Episode 6)
• Oprah Windfrey (Believe in the Stars:Season 3, Episode 2)
• Beastie Boys (Mike-D and Ad-Rock) (Kidney Now! : Season 3, Episode 22)
• Elvis Costello (Kidney Now! : Season 3, Episode 22)
• Mary J. Blige (Kidney Now! : Season 3, Episode 22)
• Sheryl Crowe (Kidney Now! : Season 3, Episode 22)
• Steve Earle (Kidney Now! : Season 3, Episode 22)
• Wyclef Jean (Kidney Now! : Season 3, Episode 22)
• Norah Jones (Kidney Now! : Season 3, Episode 22)
• Talib Kweli (Kidney Now! : Season 3, Episode 22)
• Cyndi Lauper (Kidney Now! : Season 3, Episode 22)
• Micheal McDonald (Kidney Now! : Season 3, Episode 22)
• Rhett Miller (Kidney Now! : Season 3, Episode 22)
• Robert Rudolph (Kidney Now! : Season 3, Episode 22)
• Clay Aiken (Kidney Now! : Season 3, Episode 22)
• Sara Bareilles (Kidney Now! : Season 3, Episode 22)
• David Schwimmer (Greenzo: Season 2, Episode 5)

• Jerry Seinfeld (SeinfeldVision: Season 2, Episode 1)

• Selma Hayek (As Elisa: Several Episodes, Season 3)

• Paul Reubens (As Gerhardt Hapsburg Black Tie: Season 1, Episode 12)

• Larry King (Larry King: Season 3, Episode 12)

• Conan O' Brian (Tracy Does Conan: Season 1, Episode 7)

• Chris Matthews (Hard Ball: Season 1, Episode 15)

• Tucker Carlson (Hard Ball: Season 1, Episode 15)

• Rachel Dratch (Various Roles: Several Episodes, Season 1)

• Jon Hamm (As Dr Baird: Several Episodes, Season 3)
• Julianne Moore (As Nancy Donovan Secret Santa: Season 4, Episode 8 and Winter Madness: Season 4, Episode 11)
• Larry Wilcox (Secret Santa: Season 4, Episode 8)
• Calvin Klein (The Bubble: Season 3, Episode 15)
  
• James Franco (Klaus and Greta: Season 4, Episode 9)
• Jon Bon Jovi (Anna Howard Shaw Day: Season 4, Episode 13)
• John Lithgow (Goodbye, My Friend: Season 3, Episode 13)