The onlooker's video has been viewed more than 40,000 times.
A New Zealand Police spokesperson says it isn't uncommon for police officers to be affected by residual spray.
Thousands of people flocked to social media to view the video with some criticising the suspect and person who filmed the incident while praising the officer for her efforts.
"Something to be proud of... Not!" one person wrote.
Another said: "Good on her strong enough to carry on when anyone else would drop cry like a baby after being pepper-sprayed."
Others saw the funny side, poking fun at the incident.
"Sign him up for the Warriors. He ran more metres than their forward pack last week," one laughed.
A second added: "Solid run koro! Wow lady cop you got gassed and pepper-sprayed yourself for your efforts."