| En Name: | Isilkul |
| Ru Name: | Исилькуль |
| Coordinates: | 54.95°N 86°W |
| Map Label Position: | right |
| Federal Subject: | Omsk Oblast |
| Adm City Jur: | town of oblast significance of Isilkul |
| Adm Ctr Of1: | Isilkulsky District |
| Adm Ctr Of2: | town of oblast significance of Isilkul |
| Inhabloc Cat: | Town |
| Mun District Jur: | Isilkulsky Municipal District |
| Urban Settlement Jur: | Isilkul Urban Settlement |
| Mun Admctr Of1: | Isilkulsky Municipal District |
| Mun Admctr Of2: | Isilkul Urban Settlement |
| Leader Title: | Head of Administration |
| Leader Name: | Vladimir Suslenko |
| Pop 2010Census: | 24482 |
| Postal Codes: | 646020, 646023–646025 |
Isilkul (Russian: Исильку́ль; Kazakh: Есілкөл|translit=Esılköl) is a town in Omsk Oblast, Russia, located 120km (80miles) west of Omsk, the administrative center of the oblast. Population:
The name of the town is Kazakh, with "Esil" being the Kazakh name for the Ishim River and "köl" meaning 'lake'.
Within the framework of administrative divisions, Isilkul serves as the administrative center of Isilkulsky District, even though it is not a part of it.[1] As an administrative division, it is incorporated separately as the town of oblast significance of Isilkul—an administrative unit with the status equal to that of the districts. As a municipal division, the town of oblast significance of Isilkul is incorporated within Isilkusky Municipal District as Isilkul Urban Settlement.[2]
The town is a transfer point on the southern branch of the Trans-Siberian Railway between the Western Siberian and Sverdlovsk railroads.