And upward of 330 have had allegations of sexual misconduct made against them.
This year alone, five teachers have been struck off and 82 have faced or are currently facing allegations.
The Teaching Council of New Zealand revealed, under an Official Information Act request, that from 2015 to July this year, 23 teachers have had their registration cancelled as a result of a conviction for sex offending.
It could not confirm how many of those offences were against children or young people in the teacher's care.
In 2016 eight teachers were struck off, and already this year five have had registrations cancelled.
Allegations against teachers that "include reference to sexual misconduct'' have reached 82 this year - on track to surpass the 92 in the whole of 2018.
A council spokeswoman said allegations varied in seriousness from an inappropriate joke through to a specified offence of a sexual nature.
While some teachers were struck off, others were censured or had conditions placed on their practising certificates.
Some complaints did not result in any action and some were still under investigation.
"Having just one case a year is a concern,'' said the spokeswoman. "We want the best people teaching our children and we take action against anyone who does not meet the high expectations the public and the profession has of teachers.''
Concerns and complaints came to the council from mandatory reports from schools or centres, complaints from parents or others, or reports that a teacher has a criminal conviction.
"If a teacher is convicted of one of the criminal offences listed in the Children's Act 2014 - a range of serious crimes mostly involving violence and sexual abuse - their registration is immediately cancelled,'' the spokeswoman said.
Those offences include a raft of sex crimes and indecencies against children such as grooming, exploitation and inappropriate communication.
The spokeswoman said it was also important to note that, in context, a "very small'' number of teachers were struck off for sex offending.
"There are more than 100,000 teachers in New Zealand. The vast majority of them are utterly trustworthy and competent,'' she said.
All allegations of concern about teacher conduct were investigated by the council.
"Nobody can or should consider that it's acceptable for anyone to offend against children under any circumstances,'' Ministry of Education spokeswoman Katrina Casey said.
"Unfortunately, despite all the checks and balances and systems and guidelines, a very small number of people have been caught offending against children and young people.''
National education spokeswoman Nikki Kaye said the figures were concerning.
She called on education Minister Chris Hipkins to have a "transparent discussion'' about whether improvements were needed to the current vetting system.
