90.1% of the population in Sleman Regency is Muslim.

The Muslim population in Sleman Regency, as of December 31, 2023, was recorded at 1.01 million people. Compared to the previous year, the number of Muslims in the regency/city increased by 21,891.

According to data from the Directorate General of Population and Civil Registration (Ditjen Dukcapil) of the Ministry of Home Affairs, the proportion of Muslims in this regency/city reached 90.1 percent of the total population in 2024, which numbered 1.12 million.

Considering the distribution across the total population of each regency/city in Yogyakarta Special Region, the Muslim population in Sleman Regency is among the highest.

The following is a list of the population in Yogyakarta Special Region by religion in 2023:

• Islam 1,007,630 (90.1%)
• Catholic 70,118 (6.27%)
• Protestant 32,935 (2.94%)
• Hindu 1,162 (0.1%)
• Buddhist 713 (0.06%)
• Confucian 32 (0.0%)
• Indigenous Beliefs 26 (0.0%)

Compared to other regions in Yogyakarta Special Region, this regency/city has the largest Muslim population.

Other regions with the highest number of Muslims are Bantul Regency with 933,601 people, Gunung Kidul Regency with 749,499 people, Kulon Progo Regency with 423,156 people, and Yogyakarta City with 347,017 people.