Halloween is the first day in a triduum of Catholic feasts called "Allhallowtide." All Hallow meaning "All Saints."
So, as a liturgical feast? Yes. As a secular festival about ghosts and monsters and killers? No. That said, the feast has embraced the imagery of death in many cultures as part of the custom of remembering the Saints. We hold up the images of death and suffering often regarding the saints as a taunt in the face of death. That is to say, "do your worst, we are the Easter People. Kill us and we live." Our primary symbol, after all, is the crucified Christ for this very reason. Read this. It's an excellent explanation: HALLOWEENHalloween.