Sisinnius

Sisinnius (, Sisinnios, also Sissinnios) may refer to:


 * Pope Sisinnius, Pope for about three weeks in 708
 * Sisinnius I of Constantinople, Archbishop of Constantinople from 426 to 427
 * Sisinnius II of Constantinople, Ecumenical Patriarch of Constantinople from 996 to 998
 * Saint Sisinnius, one of the martyred missionaries sent by Saint Vigilius of Trent
 * Saint Sisinnius of Parthia, depicted in "holy rider" charms of the Byzantine Period; see Gello
 * Susenyos I, Emperor of Ethiopia from 1608 to 1632
 * Susenyos II, Emperor of Ethiopia for about four months in 1770