Open Knowledge (known as the Open Knowledge Foundation (OKF) until April 2014) is a global non-profit network that promotes and shares information at no charge, including both content and data. It was founded by Rufus Pollock on 24 May 2004 in Cambridge, UK.

Open knowledge is knowledge that one is free to use, reuse, and redistribute without legal, social or technological restriction. Open knowledge is a set of principles and methodologies related to the production and distribution of knowledge works in an open manner. Knowledge is interpreted broadly to include data, content and general information.