| Ioannis Diakos Ιωάννης Διάκος | |
| Birth Date: | c. 1805 |
| Birth Place: | Pyrgos, (now Greece) |
| Death Date: | 1887 (age 82) |
| Nationality: | Greek |
| Occupation: | Greek revolutionary leader |
Ioannis Diakos (Greek: Ιωάννης Διάκος, c. 1805-1887) was a Greek revolutionary leader during the Greek War of Independence. He was a chief of Pyrgos and battled during the Greek War of Independence and at the time, he was a general of Pyrgos. Petros Mitzos killed his father in 1823 in which that in the political battlefield he also killed Stamatis Krestenitis.