The International Society of Limnology (SIL) is an international scientific society that disseminates information among limnologists, those who study all aspects of inland waters, including their physics, chemistry, biology, geology, and management. It was founded by August Thienemann and Einar Naumann in 1922 as the International Association of Theoretical and Applied Limnology and Societas Internationalis Limnologiae.

It had about 2800 members in 2008. SIL celebrated its 100th anniversary at a meeting in Berlin, Germany, in August 2022.^[1]

SIL publishes the following scientific publications:

the journal Fundamental and Applied Limnology:Archiv für Hydrobiologie ISSN 1863-9135 ; prior to 2007, it was called Archiv für Hydrobiologie.
Communications (Mitteilungen), irregular publication.
Limnology in Developing Countries, a book series.
Congress proceedings, until 2007, published as Verhandlungen Internationale Vereinigung für theoretische und angewandte Limnologie.
SIL has discontinued publication of the Verhandlungen and has replaced it with a peer-reviewed journal entitled Inland Waters. The new journal was launched at the 31st SIL Congress in Cape Town 2010,^[2] with first publication in 2011. The journal is supported by the electronic submission and tracking system of the Freshwater Biological Association. Manuscripts will be published consecutively online (as accepted) and quarterly in paper format. Access to the electronic version is provided to all SIL members and subscribers.