Western Tanzania Conference (WTC) is comprised of three complete governmental regions (Kagera, Kigoma, and Tabora) and the Chato district. Its headquarters is at Kilimahewa in Kigoma town, and its postal address is 519, Kigoma, Tanzania. The conference operates under the Northern Tanzania Union Conference in the East-Central Africa Division of Seventh-day Adventists.
The Western Ukrainian Conference is the westernmost Ukrainian church unit, in operation since 1990.
The White Sea Mission was a Russian church unit that operated from 1912 to 1926.
The Wire Hill Mission Station in Kenya was opened in 1909.
The Yangon Central Seventh-day Adventist church was the first congregation to be organized in Burma (now Myanmar).
Yangon Mission (formerly Yangon Adventist Mission) was established in 1977 as Yangon Attached District. Yangon Mission is a part of the Myanmar Union Mission in the Southern Asia-Pacific Division of Seventh-day Adventists.
Zambesi Conference was a church administrative unit of the Zimbabwe Union Conference of Seventh-day Adventists from 1929 to 1992.
Zambia Union Conference was a church administrative unit of the Seventh-day Adventist Church from 1972 to 2014.
Formerly Southwestern Mindanao Attached Field, Zamboanga Peninsula Mission was organized in 2004 and reorganized in 2008. It is a part of South Philippine Union Conference in the Southern Asia Pacific Division of Seventh-day Adventists.
Formerly part of Zimbabwe Union Conference and organized in 2018, Zimbabwe Central Union Conference is a subsidiary church administrative unit of the Southern Africa-Indian Ocean Division of Seventh-day Adventists. Its headquarters is in Kwekwe, Zimbabwe.
Zimbabwe East Union Conference is a subsidiary church administrative unit of the Southern Africa-Indian Ocean Division of Seventh-day Adventists.
The Zimbabwe West Union Conference is a church administrative unit in the Southern Africa-Indian Ocean Division of Seventh-day Adventists.