Nationals of all countries should have visa to visit Kazakhstan.

Nationals of the following countries do not need invitation letters when applying for one month single entry visa:

Australia, Austria, Belgium, Canada, Denmark, Finland, France, Germany, Great Britain, Greece, Iceland, Ireland, Italy, Japan, Republic of Korea, Lichtenstein, Luxemburg, Malaysia, Monaco, Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, USA.

All they need to present is a letter of introduction explaining the purpose of the visit.