| Korostyshiv Raion | |
| Native Name: | Коростишівський район |
| Native Name Lang: | uk |
| Settlement Type: | Raion |
| Flag Alt: | Flag of Korostyshiv Raion |
| Shield Alt: | Coat of arms of Korostyshiv Raion |
| Mapsize: | 225px |
| Coordinates: | 50.3147°N 29.0661°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Zhytomyr Oblast |
| Parts Type: | Subdivisions |
| Parts Style: | coll |
| P1: | 1 — city councils |
| P2: | 0 — settlement councils |
| P3: | — rural councils |
| P4: | Number of localities: 1 — cities |
| P5: | |
| P6: | — villages |
| P7: | — rural settlements |
| Established Title1: | Established |
| Established Title2: | Disestablished |
| Established Date2: | 18 July 2020 |
| Seat Type: | Admin. center |
| Seat: | Korostyshiv |
| Leader Title: | Governor |
| Leader Title1: | Chairman |
| Unit Pref: | Metric |
| Area Total Km2: | 973.9 |
| Population Total: | 39432 |
| Population As Of: | 2020 |
| Population Density Km2: | auto |
| Timezone1: | EET |
| Utc Offset1: | +02:00 |
| Timezone1 Dst: | EEST |
| Utc Offset1 Dst: | +03:00 |
| Postal Code Type: | Postal index |
| Area Code Type: | Area code |
| Area Code: | +380 |
Korostyshiv Raion (Ukrainian: Коростишівський район) was a raion (district) of Zhytomyr Oblast, northern Ukraine. Its administrative centre was located at Korostyshiv. The raion covered an area of 973.9km2. The raion was abolished on 18 July 2020 as part of the administrative reform of Ukraine, which reduced the number of raions of Zhytomyr Oblast to four. The area of Korostyshiv Raion was merged into Zhytomyr Raion.[1] [2] The last estimate of the raion population was