| Abdallah ibn Qais | |
| Native Name: | عبد الله بن قيس |
| Native Name Lang: | ar |
| Allegiance: | Umayyad |
| Branch: | Navy |
| Rank: | Admiral-in-chief |
| Relations: | Qais (father) |
Abdallah ibn Qais (Κάϊσος, Kaisos and Greek, Ancient (to 1453);: Ἀβδελᾶς, Abdelas in Greek sources) was an Umayyad military leader active against the Byzantine Empire in the 670s. In ca. 672/673 he led a raid into Cilicia and Lycia, and wintered there before returning to Syria. In 674/675, by which time, according to al-Tabari, he was admiral-in-chief of the Umayyad navy, he led a raid against the island of Crete along with general Fadala ibn Ubayd.