The prize recognizes Tusk’s "unwavering commitment to restoring democracy in Poland, rebuilding institutions, and rehabilitating and upholding the principles of the rule of law."
The choice was announced at Chatham House’s London Conference on Thursday.
Tusk is scheduled to collect the prize in person in the British capital later this year.
The Chatham House Prize, presented annually, is awarded to individuals or organizations selected by the institute’s members for their significant contributions to enhancing international relations in the previous year.
Bronwen Maddox, director of Chatham House, said: "Donald Tusk has played an extraordinary role championing the democratic values of the European Union and is a more than worthy recipient of our annual prize. We very much look forward to awarding it to him in person at Chatham House later in the year."
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Source: chathamhouse.org