Sliba-zkha (the name means 'the cross has conquered' in Syriac) was patriarch of the Church of the East from 714 to 728.
Brief accounts of Sliba-zkha's patriarchate are given in the Ecclesiastical Chronicle of the Jacobite writer Bar Hebraeus (floruit 1280) and in the ecclesiastical histories of the Nestorian writers Mari ibn Suleiman (twelfth-century), ʿAmr (fourteenth-century) and Sliba (fourteenth-century).
He is also mentioned in an unfavourable anecdote in Thomas of Marga's Book of Governors.
He was from Karka d'Piroz, which is today called Karkani, in the Tirhan region.
[1] According to ʿAbdishoʿ of Nisibis, Sliba-zkha established metropolitan provinces for Herat, Samarqand, India and China.