美國結婚, 香港辦離婚, 可以在嗎

yes, you can do it in HK. but you must have a good cause and proof why you want to divorce him.
also, you need to know where he about, so you can serve him the divorce document.
how you received you US residence?? if by marriage, it will has some problem while you are not US citizen yet, he can file a complain to CIS say you used him to get your green card.
all divorce records are open file to public. any groverment or anyone can review it.

是可以的，但在香港申請，必須要等兩年，即分居期，然後再排期上庭辦理離婚手續，全程約需兩年半左右，到時法庭會發一張離婚令，此令世界通行。至於律師費用，視乎須否打官師，若不，二千有找。