| Church: | Church of Constantinople |
| Archbishop Of: | Ecumenical Patriarch of Constantinople |
| Term: | June/July 1001 – July 1019[1] |
| Predecessor: | Sisinnius II of Constantinople |
| Successor: | Eustathius of Constantinople |
| Death Date: | July 1019 |
Sergius II (Greek, Modern (1453-);: Σέργιος Β′; died July 1019) was the Ecumenical Patriarch of Constantinople from July 1001 to 1019.
According to the history of John Skylitzes, he was a relative of the celebrated 9th-century patriarch Photius.[1] In 1001, he was abbot of the Monastery of Manuel, which had been re-founded by Photius, when he was elected to fill the patriarchal see (June/July).[1]
According to the later legend, Sergius II was in the conflict with the Pope Sergius IV.[2]
According to Skylitzes, he died in July 1019. His successor was Eustathius.[1]