Did any of the Beatles meet the Kray twins?

The answer seems to be - probably. There is no documentary evidence that there was direct contact between any of the Fab Four (or their one time manager Brian Epstein) and either of the Krays. There has, however, been much speculation that because:

. they all moved in the same 'swinging sixties elites' circles, and,
. Epstein was gay and a poor gambler (therefore likely a criminal's target}, and,
. No one knows who supplied the illegal substances some of the band used,

it is quite possible that there was direct contact between at least some of the members.

The closest 'suggestion' of contact is that separate photographs of the four and the twins were contained in "David Bailey's Box of Pin-Ups", a photographic collection of celebrities that was published in the sixties.

https://www.heydullblog.com/uncategorized/the-beatles-and-the-krays/
https://www.theguardian.com/uk-news/2015/sep/03/the-selling-of-the-krays-how-two-mediocre-criminals-created-their-own-legendlegends