There is precious little information available online, but it seems highly probable that amateur radio is regulated in Haiti. The regulator is called CONATEL and has a website (http://www.contatel.gouv.hthttp://www.conatel.gouv.ht) but I was unable to find any information on its website about amateur radio ("radio amateur" in French).
There are hams in Haiti with callsigns, though, which is strong evidence that there is some regulation. Some websites allege that there may only be a few licensed hams in Haiti, perhaps in the single digits.
I would suggest contacting CONATEL and asking them. Haiti could sure use some more radio amateurs, since it's so prone to natural disasters.
EDIT: Here is a blog post that has some postal contact information for an amateur radio club in Port-au-Prince: http://f4czv-richard.blogspot.ca/2017/12/haiti-le-radio-club-dhaiti-fetera-ses.html