Nahashon Nyasimi Osebe was the first Adventist lay evangelist to work among the Kipsigis.
John Oss (史約翰; Pinyin Shǐ Yuēhàn) was an Adventist colporteur, minister, administrator, and missionary to China. He was the official pioneer missionary to open the first wave of the denomination’s work in Mongolia. He witnessed wars in China and was a prisoner of war.
Melvin and Mae Oss were missionaries to India. Melvin was the founder of Camp MiVoden and co-founder of Upper Columbia Academy.
Missionary to China, colporteur, fundraiser for Adventist and Red Cross hospitals and educational institutions, writer, and public speaker. Oss witnessed the Shanghai incident and the Second Sino-Japanese War in Shanghai and was a World War II Japanese concentration-camp survivor. Oss with her husband John returned to China after recuperating in the United States and stayed until they were forced to leave by the Communist Chinese government in 1950.
Osun Conference came into being on May 15, 2011, when the West Nigeria Conference executive committee voted to adopt the resolution of the North-Western Nigeria Union Mission constituency to restructure the conference.
Ephraim Olatunde Osundele was a publishing director and church administrator for the Seventh-day Adventist church in Nigeria.
Theodore L. Oswald, minister, missionary in South America, and conference president, led the Home Missionary (Personal Ministries) department of the General Conference from 1946 to 1958.
Simeon Dea Otieno, a native of Utegi, Tarime, Mara Region, Tanzania, was an Adventist pastor, teacher, and evangelist, and the first African pastor to hold the position of executive secretary of the Tanzania Union Mission.
Dr. Carl Ottosen was a founder, promoter, and leader of the Seventh-day Adventist health work in Scandinavia. Together with his wife, Johanne Pauline, he founded Frydenstrand Sanatorium and Skodsborg Sanatorium in Denmark, following Dr. John Harvey Kellogg’s model from Battle Creek in America. His influence and groundbreaking work set a new trend for preventive and curative health work in Denmark and earned him the respect of his colleagues and the order of Knight of Dannebrog from the Danish king.2 He was a strong supporter and participant of the Adventist church work in his home country, Denmark.
Boaz Otuoma was a lay evangelist, colporteur, and church minister in Kenya.
"Our Little Friend" was a special periodical for children in Australasia published between 1933 and 1977. It was preceded by Our Young Friends, published for about 18-months beginning in 1891, and Children’s Friend, published from approximately 1901 to 1903.
Overseas Korean Adventist churches were established by Koreans Adventists who accepted the Adventist faith in Korea and immigrated abroad. In 2020, Korean Adventist churches existed in Americas, New Zealand, Germany/Austria, France, Australia, Japan, China, Philippines, Thailand, and Kyrgyzstan.
Dudley and Sarah Owen, with two of their children, sailed on the Pitcairn in 1894 for mission service in the South Pacific, where the family’s contribution included helping to establish sanitariums in Samoa and New Zealand.
Blythe Owen was a piano soloist, a prolific and celebrated composer, and an educator at seven institutions of higher learning, including Northwestern, Walla Walla, and Andrews universities.
John Ayodeji Owodipupo Owolabi was a pastor, educator, and church administrator from Nigeria.
Hezekiah Oluwole Oyeleke was a pastor and church administrator in Nigeria.
Jacob Oyetoro Oyelese was the king ("Baale") of Erunmu in Nigeria, which became the homebase of Adventist missionaries.
A. B. Oyen’s service with the Seventh-day Adventist church lasted only about 13 years but it took a wide variety of forms including editor, college teacher, publishing house manager, and secretary of the General Conference.
Nathan Amunga Oyiengo was a pastor and administrator in Kenya.