Santiago Antonio Fonacier y Suguitan (May 21, 1885 – December 8, 1977) was a Filipino priest, bishop, writer, educator, and politician who became a senator and the second Obispo Maximo of the Iglesia Filipina Independiente, also informally known as the Aglipayan Church.

[1] He edited and translated Spanish periodicals and Jose Rizal’s two novels, Noli Me Tangere and El Filibusterismo into Ilocano.

[2] Fonacier was an early follower of the schismatic Iglesia Filipina Independiente (IFI) founded by Isabelo de los Reyes and Gregorio Aglipay in 1902.

After losing a legal challenge against his successors, Fonacier seceded from the IFI and established the Independent Church of Filipino Christians (ICFC) in 1955, which later became a member of the International Association for Religious Freedom (IARF), and which also later produced another separate denomination called "Aglipay Memorial Church" (AMC).

The statement emphasized on urging its congregation "to give it with distinction to seek and extend forgiveness and understanding, to offer and reach-out for love and reconciliation", as well as "thanking God for the life and ministry of Fonacier".

[7] Also nicknamed "Ago", Santiago Fonacier was married to Carmen Marcelina Amor Jamias – who was introduced to him by Gregorio Aglipay – in September 1909 and had eight children.