| Ioniveyem | |
| Map: | Chukchi Sea5IVM.png |
| Mouth: | Chukchi Sea |
| Mouth Coordinates: | 66.2575°N -173.9534°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 185km (115miles) |
| Basin Size: | 4890km2 |
The Ioniveyem (Russian: Ионивеем,[1] also Ионивээм Ioniveem, Yeni-Veyem and Yoniveem) is a river located in the Chukotka Peninsula in Far East Siberia, Russia. It flows northwards into the Kolyuchinskaya Bay, Chukchi Sea. It is long, and has a drainage basin of .
Mount Ioni and Ioni lake are located close to it to the east in mid course.
This river and its basin belong to the Chukotka Autonomous Okrug administrative region of Russia.