Muhammad Ilyas Ruhiat (January 31, 1934 - December 18, 2007) better known as Ajengan Ilyas was an Indonesian Ulama and the leader of Cipasung Islamic Boarding School and also a Leader of Supreme Council (Ra'is 'Aam) Nahdlatul Ulama from 1992 until 1999.

Ruhiat was a National Hero of Indonesia and was also the founder of Cipasung Islamic Boarding School.

He was selected as branch leader of executive council of Nahdlatul Ulama in Tasikmalaya in 1954.

He was selected as vice region leader of supreme council of Nahdlatul Ulama in West Java 1985 until 1989.

Ilyas died at Hasan Sadikin Hospital December 18, 2007 from a stroke and diabetes, and he was buried at Cipasung Islamic Boarding School Cemetery.