1. Cesar Romero in Batman (1966).
2. Jack Nicholson in Batman (1989).
3. Heath Ledger in The Dark Knight (2008).
4. Jared Leto in Suicide Squad (2016).
5. Joaquin Phoenix in Joker (2019).
Off topic... Just some history ...
The Man Who Laughs (1928)
Conrad Veidt ... Gwynplaine / Lord Clancharlie
Gwynplaine's fixed grin and disturbing clown-like appearance
was a key inspiration for comic book talents
writer Bill Finger and artists Bob Kane and Jerry Robinson
in creating Batman's greatest enemy, The Joker.
May I suggest one small edit? (just adding the article "a" like below)
Whose performance as The Joker in a live action movies or TV series do you think is the best?
I just saw 'Joker' and while I was not very impressed with the film, Phoenix's performance was not only the best portrayal of Joker that I've seen (I've seen Nicholson's and Ledger's) but one of the most exceptional performances that I've ever seen. Wow.
The Best Joker
8223rd Live Poll: https://www.imdb.com/poll/tCo9-Fsijfw/
This is the 2,683rd image poll. Such polls have a total of 4,538,097 votes for an average of 1,691 votes per poll.
Total Number of Votes 18,676,722 Projected Date of 20 Million Votes 4-Jan-2021 Days Until 20 Million Votes 301This is the list of Dibyayan_Chakravorty's polls as of 6-Oct-2019:
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