0.00258% of the population in Aceh Barat Daya Regency is Catholic.

The Catholic population in Aceh Barat Daya Regency, as of December 31, 2023, was recorded as four individuals. Compared to the previous year, the number of Catholic residents in the regency/city decreased by four.

According to data from the Directorate General of Population and Civil Registration (Ditjen Dukcapil) of the Ministry of Home Affairs, the proportion of Catholics in this regency/city reached 0.00258 percent of the total population in 2024, which numbered 155,000.

Considering the distribution relative to the population of each area in Aceh, the proportion of Catholics in Aceh Barat Daya Regency ranks 23rd.

Meanwhile, the population of Aceh by religion in 2023 was as follows:
* Islam: 154,543 (99.71%)
* Buddhist: 197 (0.13%)
* Protestant: 44 (0.03%)
* Hindu: 12 (0.01%)
* Catholic: 4 (0.0%)
* Indigenous Beliefs: 0 (0.0%)
* Confucian: 0 (0.0%)

Other regencies/cities in Aceh with the largest Catholic populations, in descending order, are: Aceh Tenggara Regency (2,286), Aceh Singkil Regency (1,392), Subulussalam City (800), Banda Aceh City (485), Aceh Besar Regency (188), Lhokseumawe City (141), Aceh Tengah Regency (126), Aceh Tamiang Regency (92), Aceh Barat Regency (64), and Sabang City (62).