No, not really.
But like in all countries that have come under American influence, you will find random Halloween parties, especially the adult-themed kind. But it is unlikely you will see kids trick-or-treating in the streets.
Since Halloween is a predominantly American celebration, most non-American nations shun it. This can be because of nationalistic pride, but also the aversion to celebrating other people's holidays. Besides that you will also find that the DR is a Catholic country that detests anything 'demonic', and Halloween is seen as one of those 'demonic' fiestas celebrated by "those heathens." The fact that during the carnival they like to dress up in 'demonic' costumes seems to be ironic.
There is a great article about that on Kiskeya.Life: Why Dominican Don't Celebrate Halloween.