Omar Sharif
Darth Vader is
scary and I
The God
father

John Wayne comes to mind.
"The pure and simple truth is rarely pure and never simple." O. Wilde

Benicio Del Toro is right up there too.
Latino - Che + many
Black - Fenster in Usual Suspects
European - Snatch
Alien - GOTG
And Gary Oldman
He played a black guy in True Romance
American - many inc. Batman, Cop in Leon
Brit - Sid And Nancy
Romanian - Dracula
Russian - Air Force One
German - Beethoven
and both were convincing in all guises.
The best cross ethnic switch IMO was Jeffrey Wright as Peoples in Shaft. Totally convincing.

I admit, C.Heston and A.Quinn were also of various nationalities, but I didn't know that about Christopher Lee.
Cool music
http://audiosparx.com/MartinaSver

Christopher Lee blows all of the mentioned off the water. The guy has played every conceivable ethnicity except for black.
This is not my signature. This is IMDb's automatic translation of my signature.

This message has been deleted.

Armand Assante plays a lot of different types as well.

"Your knowledge of cinema is 0."
0 is also how many seconds Charlton Heston was believable as a Mexican in Touch of Evil. A dark moustache and brownface does not make for a believable performance. He played a Mexican but only in the most literal sense. He played a Mexican but didn't
play
a Mexican. A classic movie regardless due to the genius of Orson Welles.
George Carlin: It's all bullsh-t and it's bad for ya.

Nah! You must be too young to remember Charlton Heston, Yul Brynner and Kirk Douglas or Antony Quinn.
Heston was Italian Michelangelo, French Cardinal Richeliu, British general Gordon in Khartoum, being Jew and Roman citizen in Ben Hur, Jew raised as an Egyptian as Moses, Mark Anthony himself, played American presidents and soldiers, a Latino with a dark moustache in Orson Welles's B movie Touch of Evil, played an American native Indian; Douglas played Greek, a foreing slave under Roman rulership, a Viking, a militar Jew, a Dutch painter Van Gogh, an Italian mobster in The Brotherhood to name a few. Quinn was Greek big shot Onassis, Mexican desperado, an Arabian relative of prophet Muhammed, Italians, a French artist Gauguin (son of a French man and Peruvian mother who was a writer), etc, etc.
Your knowledge of cinema is 0.
There's a thin gap between skepticism and cynicism

He has a very interesting, complex ethnic and national heritage; it's no wonder he's so diverse.

Anthony Quinn is one, I don't know exactly how many nationalities he's played though.