Labour's Secretary General Andrew Kirton was made aware on Wednesday about a case of alleged sexual harassment and a separate case of alleged sexual abuse in the Christchurch sector of Young Labour.
The alleged harassment occurred during last year's election campaign period.
It is claimed a Young Labour volunteer in Christchurch sexually harassed another volunteer using an App after identifying them through a Young Labour Facebook group chat.
When asked about the allegations, Kirton said he was not prepared to comment as a police investigation was under way.
It is understood Kirton is aware that the sexual harassment claim involves a man described by others in Young Labour as a sexual predator, while the sexual abuse allegation may involve an underage teenager.
Christchurch East Labour MP Poto Williams said she was unaware of any complaints and suggested it was a matter for police.