Lifeline details will be put on signs near high-risk areas in order to provide crisis assistance information.
Sydney's Northern Beaches Council is also putting up safety fencing at some public reserve areas to curb the issue.
Some areas of particular concern have seen several incidences in areas recently.
The signage is a result of the Northern Beaches Suicide Prevention Working Group, with more fencing to be rolled out by the council in coming months.
If you or someone you know needs help, contact Lifeline on 13 11 14.