| Official Name: | Stepnogorsk |
| Native Name: | Степногорск |
| Pushpin Map: | Kazakhstan |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Kazakhstan |
| Subdivision Type: | Country |
| Subdivision Name: | Kazakhstan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Akmola Region |
| Subdivision Type2: | District |
| Government Type: | Mayor-council government |
| Leader Title: | Mayor |
| Leader Name: | Kairzhanov Alpysbay |
| Unit Pref: | Imperial |
| Population As Of: | 2009 |
| Population Total: | 46,712 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Utc Offset: | +5 |
| Coordinates: | 52.3497°N 71.89°W |
Stepnogorsk (Kazakh: Степногорск|translit=Stepnogorsk; Russian: Степногорск) is a town in Akmola Region, Kazakhstan.
Stepnogorsk was established in 1959, and has been a town since 1964. It began as a closed town with code names Tselinograd-25 (Russian: Целиноград-25), Makinsk-2 (Russian: Макинск-2). The town is known as a nuclear and biochemical site,[1] which was known as the Stepnogorsk Scientific and Technical Institute for Microbiology.