It depends on where you're from.
For most countries you're allowed to stay for up to 90 days without a visa.
The full list of visa requirements, as well as how to get a visa, is available at the website of the Hong Kong Immigration department (see related link below).
However, if you want to pass the border into the rest of Mainland China (except Macau), you will need a visa!
Hi does singaporean passport holders needs a visa to enter turkey?
South African passport holders do not require a visa for travel to Singapore for a stay of up to 30 days, providing a Social Visit Pass is obtained on arrival. Extensions are possible for a fee of S$40.
No
Yes
yes
Yes they do.
No, you will face difficulties. They need to see your entry stamp.
No, it is not mandatory for green card holders to posses a machine readable passport (as the green card is machine readable).
No
Pakistani passport holders are exempted from visa for their travels to Turkey up to 90 days. Ordinary passport holders are required to have visa to enter Turkey.
No. US passport holders are allowed 90 days visa-free travel in Germany and the other Schengen-Agreement countries.
yes they do need visa