Yohannan is a Syriac name equivalent to English John.
It may refer to:
- Yohannan the Leper, a.k.a. Yohannan Garba ("the Leper"), originally metropolitan of Nisibis, was anti-patriarch of the Church of the East between 691 and 693
- Yohannan I, a.k.a. Yohannan I bar Marta, patriarch of the Church of the East between 680 and 683
- Yohannan II, a.k.a. Yohannan II bar Narsai, Patriarch of the Church of the East from 884 to 891
- Yohannan III, the nephew of the patriarch Theodosius (853–858), was Patriarch of the Church of the East from 893 to 899
- Yohannan IV, Patriarch of the Church of the East from 900 to 905
- Yohannan V, Patriarch of the Church of the East from 1000 to 1011
- Yohannan VI, a.k.a. Yohannan VI bar Nazuk, Patriarch of the Church of the East from 1012 to 1016
- Yohannan VII, a.k.a. Yohannan VII bar Targhal, Patriarch of the Church of the East from 1049 to 1057
- Yohannan VIII Hormizd, a.k.a. John Hormez or Hanna Hormizd, the last hereditary patriarch of the Eliya line of the Church of the East and the first patriarch of a united Chaldean Church
- K. P. Yohannan (b. 1950), founder and president of Gospel for Asia; the Metropolitan of Believers Church.
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