A former police officer has been charged after allegedly accessing personal information of 21 women on the police national database.

The 34-year-old man, who has interim name suppression, appeared in the Auckland District Court this morning on multiple counts of accessing a computer system for a dishonest purpose.

Auckland City Police Acting District Commander Jill Rogers said the charges are the result of a long-running investigation into the alleged inappropriate conduct of the accused, during his time as a police officer.

The 21 counts relate to the alleged unauthorised access of the Police National Intelligence Application system.

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Police do not believe any other staff have been involved or complicit in his alleged offending.

"We can however say that the integrity, professionalism and conduct of our staff is a key priority for NZ Police," Rogers said.

All complainants also have name suppression.