1. Ewan McGregor
    Static
    British, has the red hair and beard game, and just has the right temperament for Dumbledore, I think. My top choice for sure.
  2. Tom Hiddleston
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    I know he's got more of a Tom Riddle vibe but it could work, especially considering Dumbledore's sordid past.
  3. Tom Hardy
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    A "rough around the edges" young Dumbledore? Maybe?
  4. Anyone else?
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  5. Tom Hanks
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    Because he can do everything.
    Suggested by @tarakniep