2.2% of the population in Gunung Mas Regency is Catholic.

The Catholic population in Gunung Mas Regency as of December 31, 2023, was recorded at 2,971 people. Compared to the previous year, the number of people adhering to the Catholic faith in the regency/city increased by 331 people.

According to data from the Directorate General of Population and Civil Registration (Ditjen Dukcapil) of the Ministry of Home Affairs, the proportion of the Catholic population in this regency/city reached 2.2 percent of the total population in 2024, which numbered 132,680 people.

When viewed in terms of its distribution across the population of each region in Central Kalimantan, the proportion of the Catholic population in Gunung Mas Regency ranks 11th.

The following is a list of the population in Central Kalimantan by religion in 2023:

* Protestant: 85,584 (64.51%)
* Muslim: 26,043 (19.63%)
* Hindu: 15,599 (11.76%)
* Catholic: 2,971 (2.24%)
* Indigenous Beliefs: 37 (0.03%)
* Buddhist: 7 (0.01%)
* Confucian: 0 (0.0%)

Other regencies/cities in Central Kalimantan with the largest Catholic populations, in descending order, are: Lamandau Regency (17,389 people), Barito Timur Regency (10,119 people), Kotawaringin Timur Regency (9,555 people), Barito Selatan Regency (9,342 people), Barito Utara Regency (8,865 people), Murung Raya Regency (6,575 people), Kotawaringin Barat Regency (6,170 people), Palangkaraya City (6,170 people), Seruyan Regency (5,757 people), and Katingan Regency (3,459 people).