| En Name: | Kalachinsky District |
| Ru Name: | Калачинский район |
| Image View: | Memorial wall kalachinsk.jpg |
| Coordinates: | 55.05°N 109°W |
| Image Coa: | Герб Калачинского района 2020 года.jpg |
| Federal Subject: | Omsk Oblast |
| Adm Data As Of: | December 2009 |
| Adm Ctr Type: | town |
| Adm Ctr Name: | Kalachinsk |
| Selsoviet Type1: | rural okrug |
| No Of Selsoviets Type1: | 12 |
| No Of Rural Localities: | 54 |
| Mun Data As Of: | July 2011 |
| Mun Formation1: | Kalachinsky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 1 |
| Mun Formation1 No Of Rural Settlements: | 12 |
| Area Km2: | 2800 |
| Pop 2010Census: | 18197 |
| Urban Pop 2010Census: | 0% |
| Rural Pop 2010Census: | 100% |
| Website: | http://www.kalachinsk.ru/ |
| Date: | August 2011 |
Kalachinsky District (Russian: Калачинский райо́н) is an administrative[1] and municipal[2] district (raion), one of the thirty-two in Omsk Oblast, Russia. It is located in the southeast of the oblast. The area of the district is 2800km2. Its administrative center is the town of Kalachinsk (which is not administratively a part of the district). Population: 18,197 (2010 Census);
Within the framework of administrative divisions, Kalachinsky District is one of the thirty-two in the oblast. The town of Kalachinsk serves as its administrative center, despite being incorporated separately as a town of oblast significance—an administrative unit with the status equal to that of the districts.
As a municipal division, the district is incorporated as Kalachinsky Municipal District, with the town of oblast significance of Kalachinsk being incorporated within it as Kalachinsk Urban Settlement.