"We would like to remind people, especially among the Pacific community, that to provide immigration advice a person must be licensed or exempt," said the Registrar of Immigration Advisers, Andrew Galloway.
"Unfortunately we hear of cases where even trusted friends or family have been recommended to help a person out with immigration advice, and it turns out they aren't licensed."
Those found breaking the law could face up to seven years in prison and a fine of up to $100,000.
Galloway said people should check if someone was allowed to give immigration advice even if the person was recommended or known to them.
Immigration Advisers must be licensed by the IAA or be an exempt person, such as a New Zealand lawyer.
Galloway said people using unlicensed advice could result in "a range of negative outcomes" including having their visa applications returned.
"People should be particularly wary of claims of special access, or people claiming to have contacts within INZ that can help them with an immigration matter," he added.
The IAA's online register of licensed advisers is available for those who want to search for a licensed immigration adviser at www.iaa.govt.nz.