Civil society organisations are calling on Forum leaders to support the cluster munitions convention when it opens for signatures later this year.
An international conference in May, attended by more than 100 nations, agreed a draft treaty to ban the use of cluster munitions.
Cluster munitions open in mid-air and scatter as many as several hundred bomblets over a wide area.
Ema Tagicakibau, from the Pacific Concerns Resource Centre, says Pacific governments tend to ignore cluster munitions because they are not used in the region.
But she says they are used in areas where Pacific soldiers are peacekeepers.
Ema Tagicakibau says governments have a responsibility to support the treaty for a more secure world.