About 20 people picketed for two hours on the corner of Gala St and Queens Dr to raise awareness of the issue and fight for better pay.
Public Service Association organiser Shaun Scott said the group in the Deep South was part of a 1900-workers strike which was happening simultaneously in nine regions across the country.
"What this means is that community corrections staff, they’ve reached the end of their tether.
"They care about the work that they do — supporting vulnerable people in the community, and can keep our communities safe.
He said this was the second two-hour strike and the action followed nine months of negotiations with Corrections.
"There is a really good feeling amongst the members here.
"They’re really determined to get justice around pay and conditions. They don’t walk off the job easily. They really care about the people they work with and care about the community — so it was a big thing for them to take this action.
"They’re feeling pretty strong."
Electronic-monitoring staff, practice leaders, community work supervisors, programme facilitators, probation and bail support officers were among the workers who took part.
Mr Scott said the work they did was really important as they looked after people who had been released from prison or that had come into the criminal justice system in some way.
"So it’s really important, it helps keep the community safe, and it helps create a pathway for those people as well, to have a good and fulfilling life.
"The main message is to get decent fair pay for these workers, and to be treated with dignity and respect."
Corrections deputy national commissioner Brigid Kean acknowledged the staff had a challenging job and said they valued the staff for the hard work they did and their contribution to keep the public and communities safe.
She said public safety was the top of their priorities and would ensure no-one was put in danger during the strike.
"The Invercargill Community Corrections office was closed to the public from 2pm to 4pm and there were no scheduled appointments during that time.
"All Corrections matters with the district court were managed today without issue."
