In October, a 41-year-old Port of Tauranga worker had his foot cut off by a wire rope that was part of a winch. In 2011, Walter Crosa, 49, died at the port when he was hit by a reversing grader.
Today, Rail and Maritime Transport Union members will commemorate their fallen comrades at a memorial near the port's Rata St gatehouse.
Union general secretary Wayne Butson said they were recommiting to fighting for the best possible health and safety standards and to change attitudes and behaviours.
He said 27 union rail and port members had been killed at work since 1994.
New Zealand Council of Trade Unions president Helen Kelly said there was a general requirement that organisations protected workers' safety but there needed to be a culture change putting health and safety in the highest priority.
Tauranga MP and Labour Minister Simon Bridges said the trauma of a workplace death never left bereaved family, friends and work colleagues.
"Too many New Zealanders are killed or harmed at work. Workers' Memorial Day is a time to reflect on the critical importance of safe and healthy workplaces." He said an independent taskforce would recommend reforms of the system to bring down the death and injury toll in workplaces.