Diplomatic agents?that is, high ranking embassy officials (ambassadors, for example) who serve the function of dealing directly with their host country's officials on behalf of their home country? enjoy the highest degree of immunity. The same applies to their family members.

Do UN ambassadors have diplomatic immunity?

The heads of UN agencies, for example, generally have the same level of immunity as diplomats. The major difference being UN heads are immune from prosecution in all countries.

Who all get diplomatic immunity?

Immunity from giving Witnesses

Diplomatic agents are immune from being presented as witnesses in a civil, criminal, or administrative code of the state to which they are accredited. Article 31(2) of the Vienna Convention provides that a diplomatic agent is not obliged to give any evidence as a witness in any case.