Police are hunting for a juvenile sex attacker who has indecently assaulted up to 11 women since October last year.

Police say a boy aged between 12 and 16-old-years old has been responsible for a series of indecent assaults on women in Onehunga.

In each case the boy, described as a young Maori or Pacific Islander of thin to slim build, has approached women from behind while they have been walking or running alone in the Onehunga area.

Police have launched a dedicated 0800 number and asking anyone who may recognise the boy to call them.

They have also released a map of when and where the women have been attacked.

The most recent assault happened on March 23 in Gambia Place.

The majority of the attacks happened around the Fergusson Domain, but other assaults have occurred in Oranga Avenue, Arthur Street, Grey Street and Amaru Rd.

In many of the attacks he was wearing a grey hooded sweatshirt and knee-length shorts.

Police said they were taking the unusual step of showing the public maps and timelines of the attack in the hope friends and family of the wanted teen will recognise him.

"We're taking the step this morning of releasing a map which shows the locations, times and dates where the women have been indecently assaulted.

We're doing this as well as providing a description of the person we believe is responsible for these assaults" said Detective Constable Patrick Whitiora.

"The description of this offender is of a very young person - behaviour such as this in a young person is worrying, and we want to not only apprehend this person to obviously stop any more indecent assaults but we also need to get him help," he said.