Vidal appears in Season 18’s “Moe'N'a Lisa”, where he gets kicked out of a poetry club for admitting he titled his poems after random things he saw when trying to think of a name.
7.Jose Canseco - Baseball Player
Cameo
✓
Nope
✓
Canseco appeared in Season 3’s “Homer at the Bat”.
8.Matt Damon - Actor
Cameo
✓
Nope
✓
9.Shirley Temple - Actress, Diplomat
Cameo
✓
Nope
✓
She chose not to appear on the show.
10.Barry White - Singer
Cameo
✓
Nope
✓
White appeared in Season 4’s “Whacking Day”. He claims to “love the sexy slither of a lady snake” when asked to defend snakes from being whacked.
11.Daniel Day-Lewis - Oscar-Winning Actor
Cameo
✓
Nope
✓
Day-Lewis turned down appearing as “Side Show Daniel Day-Lewis”.
12.Pope Francis - Pope
Cameo
✓
Nope
✓
Pope Francis’s only appearance in “Haw-Haw Land” wasn’t voiced.
13.Saddam Hussein - Dictator
Cameo
✓
Nope
✓
Of course not.
14.LeBron James - Basketball
Cameo
✓
Nope
✓
James appeared in Season 16’s “Homer and Ned's Hail Mary Pass”, along with Yao Ming, Tom Brady, Michelle Kwan, and Warren Sapp.
15.Paul McCartney - The Beatles
Cameo
✓
Nope
✓
McCartney appeared in Season 7’s “Lisa the Vegetarian”. He only agreed to join the show of Lisa permanently became a vegetarian.
16.Tony Blair - Prime Minister
Cameo
✓
Nope
✓
Then Prime Minister Tony Blair appeared in Season 15’s “The Regina Monologues”. Homer mistook him for Mr. Bean.
17.Elizabeth Taylor - Oscar-Winning Actress
Cameo
✓
Nope
✓
One of many cameos from Season 4’s “Krusty Gets Kancelled”. She also voiced Maggie’s first word.
18.Nelson Mandela - President
Cameo
✓
Nope
✓
Mandela was never a voiced character in the Simpsons.
19.Jeff Bezos - Amazon
Cameo
✓
Nope
✓
Bezos appears in Season 20’s “The Burns and the Bees”. He wets himself at Billionaire’s camp.
20.Buzz Aldrin - Astronaut
Cameo
✓
Nope
✓
Aldrin aptly appears in “Deep Space Homer”.
21.Tony Hawk - Skateboarder
Cameo
✓
Nope
✓
Hawk appeared in Season 14’s “Barting Over”.
22.Stephen Hawking - Astrophysicist
Cameo
✓
Nope
✓
He appeared in four episodes, the first being “They Saved Lisa’s Brain”.
23.Hugh Hefner - Owner of Playboy
Cameo
✓
Nope
✓
One of many cameos from Season 4’s “Krusty Gets Kancelled”.
24.Joe Frazier - Heavyweight Boxer
Cameo
✓
Nope
✓
Frazier made two appearances, the first being Season 3’s “Brother, Can You Spare Two Dimes”.
25.Julian Assange - Wikileaks
Cameo
✓
Nope
✓
Assange appears in Season 23’s “At Long Last Leave”. He moves in next door to the Simpsons. He recorded his lines from house arrest in the UK.
26.Tony Bennett - Singer
Cameo
✓
Nope
✓
Bennett was the first guest star to voice himself, in Season 2’s “Dancin’ Homer”.
27.Barack Obama - President
Cameo
✓
Nope
✓
No president or former president ever provided their own voice for the show.
28.Frank Sinatra - Singer
Cameo
✓
Nope
✓
Harry Shearer provided the voice for any Sinatra appearances. Sinatra’s music has appeared on the show on occasion, though.
29.Donald Trump - President, Businessman
Cameo
✓
Nope
✓
Trump’s voice from archival footage was used on a YouTube video, but he never voiced anyone in the show.
30.Ho Chi Minh - Dictator
Cameo
✓
Nope
✓
Ho died in 1969. He’s actually never even been referenced on the show.