'Free the Nipple' events are set to take place in both Auckland and Wellington on Saturday afternoon.
The protests have received significant attention on social media, with more than 1500 people saying they will be attending the Auckland protest at Mission Bay.
The events aim to "desexualise the female body", organisers wanting women to have the same rights to go topless in public as men.
"We aim to... build a society in which all genders are able to comfortably express themselves, free from the oppression of others," they told Newshub in a statement.
Christian group Family First is critical of the event, telling Newshub "families would find it offensive". But the organisers say the current rules show a "sexist double-standard".
"Men are able to be topless in public and on social media without consequence. A woman is unlikely to be comfortable going topless in New Zealand.
"Women are taught from an early age that their bodies are sexual objects for men, or something for them to be ashamed of."
The Free the Nipple campaign has gained global recognition since being launched in the US in 2014.
Newshub.
