The non-profit group, Institute for Justice & Democracy in Haiti, says the UN should take responsibility for the outbreak.
The institute wants an apology and compensation for victims' families and for the UN to provide a clean water and sanitation system.
The group's Brian Concannon says official Haitian ministry figures show 8000 people died and 700,000 were injured as a result of the outbreak.
However, he claims the unofficial toll could be much higher, as many victims didn't make it to treatment centres.
Mr Concannon told Ildi Amon, he believes the UN does not have diplomatic immunity as it claims.
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