Does a US citizen need a visa for Singapore for business or tourism?

A visa is not required for US citizens for business or tourism for a stay of up to 90 days in any six month period.

Please keep in mind that while a visa is not required, you must:

• Hold a passport valid at least six months on entry with TWO blank visa pages
• Hold proof of onward/return flights
• Hold all documents required for the next destination
• Hold proof of sufficient funds relative to your intended length of stay.
• Confirm with their airline that boarding will be permitted without a visa.