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Charles Gilbert and Verneita Oliver served as missionaries in Japan, Guam, and Indonesia, he as a church administrator, and she as a nurse.
Erich Willy Olm was an administrator and lawyer from Brazil.
Ricardo Olmserved as a Bible instructor, teacher, and missionary in South America.
Olmeca Conference was organized in 2001, when Tabasco Conference was divided into the Tabasco Conference and the Olmeca Conference.
Mahlon Ellsworth Olsen was an eminent Adventist health advocate, denominational historian, and educator who pioneered distance education. He was the second son of Ole Andres Olsen (July 28, 1845-January 29, 1915), president of the General Conference from 1888 to 1897.
The Norwegian Olaf Johan Olsen, also known as Iceland-Olsen and the Apostle to Iceland, had a remarkable mission career in the Seventh-day Adventist Church as a missionary pastor, leader, and administrator. In Iceland, over a period of 33 years, he raised up the local church from almost nothing to eight congregations, second only to the Lutheran State Church.
A Norwegian-born American, Ole Andres Olsen served the Seventh-day Adventist Church as a minister and senior administrator for forty-four years, becoming one of the most experienced international leaders of the movement’s second generation. He was elected as president of the General Conference at the age of forty-three and served four terms (1888–1897), providing diplomatic, spiritually sensitive, forward-thinking leadership through a difficult period of doctrinal conflict, deep financial depression, and rapid expansion that exposed the inadequacies of the denomination’s organizational structure.
The Omaura School of Ministry is located in the Eastern Highlands of Papua New Guinea (PNG), at an altitude of 4,650 feet (1,417 meters). It was originally established as the Omaura Training School, “for the purpose of training workers to carry the message to the multiplied thousands of the great inland who have not yet been reached by any mission influence.”
Daniel Kayode Omoleye was a pastor, church planter, evangelist, and church administrator from Nigeria.
Abel Nyakundi Onchoke was a pastor, educator and administrator from Kenya.
Ondo Mission, formerly South West Nigeria Conference, was organized in 1998, and reorganized and renamed in 2013. Ondo Mission covers the present Ondo state of the Federal Republic of Nigeria.
Joseph Shem Onyango was a church pioneer, pastor, preacher, evangelist, and marriage counselor from Tanzania.
Open Heart International (OHI) is a medical outreach program originally started by Sydney Adventist Hospital in 1986. It has conducted more than 188 surgical projects in 16 countries. OHI’s volunteer teams provide cardiac, plastic, reconstructive, orthopedic, women’s health, and eye surgery.
Ole Oppegard, a pioneer from Norway, served in Argentina as a literature evangelist and as the first Adventist missionary in South America dedicated to medical missionary efforts.
Alfredo Ordóñez Withol dedicated his life to pastoral and teaching ministry in Nicaragua and Honduras.
The Oriental Watchman Publishing House is the first and only Seventh-day Adventist publishing house in India. It maintains its own printing facilities in Pune, India, and is operated by the Seventh-day Adventist Publishing Association (Pvt. Ltd.), a company owned by the Southern Asia Division of Seventh-day Adventists.
Eldama Ravine is a town in Baringo County, Kenya, a few miles north of equator. It is the cradle of Adventism in the northwest part of Kenya that today has 30,078 church members who worship in 352 organized churches.
Embu East is a county in Kenya. Adventism started in Embu East at a place known as Runyenjes at a social hall built by Chief Mugucu wa Makathwa. It is the cradle of Adventism in the northeast part of Kenya that today has 24,897 church members who worship in 369 organized churches.
John Babajide Oriola was one of the Adventist pioneering ministers in Nigeria.
Organized in 1974 and reorganized in 2001, Orissa Section is part of the Central India Union Mission of the Southern Asia Division of Seventh-day Adventists.