Crisostomo Ayson Yalung (born December 3, 1953) is a former Roman Catholic bishop from the Philippines.

[2] Among Yalung's pastoral assignments were being assistant parish priest in Balibago, Angeles City (1979–1980) and formator at Mother of Good Counsel Seminary in San Fernando, Pampanga (1987–1989).

He served as Vice-Rector of the Lorenzo Mission Institute (1989-1991) and as Rector of San Carlos Seminary (1991–1994).

[citation needed] Pope John Paul II named him auxiliary bishop of Manila on March 23, 1994.

[4] His tenure as bishop was marked by the major renovation of the Cathedral of Antipolo, under the rectorship of Rev.