| Mykolaivskyi Raion | |
| Native Name: | Миколаївський район |
| Native Name Lang: | uk |
| Settlement Type: | Raion |
| Flag Alt: | Flag of Mykolaivskyi Raion |
| Shield Alt: | Coat of arms of Mykolaivskyi Raion |
| Mapsize: | 250px |
| Coordinates: | 47.4672°N 30.6031°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Parts Type: | Subdivisions |
| Parts Style: | coll |
| P1: | 0 — city councils |
| P2: | 1 — settlement councils |
| P3: | 12 — rural councils |
| P4: | Number of localities: 0 — cities |
| P5: | |
| P6: | 45 — villages |
| P7: | 0 — rural settlements |
| Established Title1: | Established |
| Established Date1: | 1946 |
| Established Title2: | Disestablished |
| Established Date2: | 18 July 2020 |
| Seat Type: | Admin. center |
| Seat: | Mykolaivka |
| Leader Title: | Governor |
| Leader Name: | Oleksandr Chornyi |
| Leader Title1: | Chairman |
| Unit Pref: | Metric |
| Area Total Km2: | 1093 |
| Population Total: | 15399 |
| 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 |
| Postal Code: | 67000—67053 |
| Area Code Type: | Area code |
| Area Code: | +380 4857 |
| Website: | http://mikolaivka-rda.odessa.gov.ua |
Mykolaivka Raion (uk|Миколаївський район) was a raion (district) in Odesa Oblast of Ukraine. Its administrative center was the urban-type settlement of Mykolaivka. The raion was abolished on 18 July 2020 as part of the administrative reform of Ukraine, which reduced the number of raions of Odesa Oblast to seven. The area of Mykolaivka Raion was merged into Berezivka Raion.[1] [2] The last estimate of the raion population was
At the time of disestablishment, the raion consisted of three hromadas:[3]