Six of the cases related to falls.
Two cases have been referred to the coroner.
The Public Health Unit and the Ministry of Primary Industries were still investigating the listeria death.
Chief medical officer John Gommans said serious and sentinel events were "always extremely distressing" for patients, their families and staff.
"As a DHB we are always looking for new ways to further reduce avoidable harm and one of the most important things a healthcare organisation could do was provide an environment where transparency was paramount so learning could come from these tragic events," Dr Gommans said.
The commission's chairman, Professor Alan Merry, said not all the events described in the report were preventable, but many involved errors that should not have happened.
Hawke's Bay DHB serious and sentinel events
2011/12: 11
2010/11: 7
2009/10: 9
2008/09: 5
2007/08: 7
2006/07: 12