Francesco Bamonte sees "a real danger" in the festival, writes the Spanish online portal "Religión Confidencial" on Monday.
This applies "even if those who celebrate it have no intention of celebrating witchcraft and the devil".
Those who celebrate Halloween are more susceptible to "acts of the devil", the priest continued.
The festival is accompanied by "an increase in blasphemy". He criticised the development of the Halloween festival.
"It was the reinterpretation by American society that turned Halloween into a consumer-orientated holiday that was increasingly stripped of its religious content. In this way, Halloween once again became a celebration of magic, horror and death."
Bamonte advocates
alternatives to Halloween that emphasise the true meaning of All Saints' Day. For example, by believers making costumes of saints.
How Halloween came about
The origins of Halloween lie in the Celtic New Year, which was celebrated at the beginning of winter.
According to Celtic tradition, the dead search for the living at this time, who are supposed to die the following year. With the Christianisation of Ireland, the festival was replaced by All Saints' Day, but certain customs were not.
Irish emigrants spread Halloween to the USA, where the festival developed into its current form.
The International Association of Exorcists was founded in Rome in 1992 and officially recognised by the Congregation for the Clergy in 2014.
According to its own information, around 250 priests working as exorcists from 30 countries belong to the association.