| Semenivka Raion | |
| Native Name: | Семенівський район |
| Native Name Lang: | uk |
| Settlement Type: | Raion |
| Flag Alt: | Flag of Semenivka Raion |
| Shield Alt: | Coat of arms of Semenivka Raion |
| Coordinates: | 49.6074°N 33.0452°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Poltava Oblast |
| Parts Type: | Subdivisions |
| Parts Style: | coll |
| P1: | — city councils |
| P2: | — settlement councils |
| P3: | — rural councils |
| P4: | Number of localities: — cities |
| P5: | |
| P6: | 64 — villages |
| P7: | — rural settlements |
| Established Title1: | Established |
| Established Date1: | 7 March 1923 |
| Established Title2: | Disestablished |
| Established Date2: | 18 July 2020 |
| Seat Type: | Admin. center |
| Seat: | Semenivka |
| Leader Title: | Governor |
| Leader Name: | Valeriy Knysh |
| Leader Title1: | Chairman |
| Unit Pref: | Metric |
| Area Total Km2: | 1300 |
| Population Total: | 23722 |
| 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: | 38200—38281 |
| Area Code Type: | Area code |
| Area Code: | +380-5341 |
| Website: | Official homepage |
Semenivka Raion (Ukrainian: Семенівський район) was a raion (district) in Poltava Oblast of central Ukraine. The raion's administrative center was the urban-type settlement of Semenivka. The raion was abolished and its territory was merged into Kremenchuk Raion on 18 July 2020 as part of the administrative reform of Ukraine, which reduced the number of raions of Poltava Oblast to four.[1] [2] The last estimate of the raion population was