In a statement, Edelman said the decision followed a "substantial review".
Michael Stewart, president and CEO, Edelman Europe & CIS, said: "I can confirm that Edelman has taken the decision to close the Edelman office in Poland. This has been a carefully considered strategic decision regarding Edelman’s investment priorities in the region. To enable us to realise our communications marketing ambition while servicing clients at scale, we are best placed to achieve this via an affiliate model.
"I am incredibly proud of the fantastic work that the team have been doing in the Polish market, and the decision to close has no reflection on their achievements, professionalism and enthusiasm."
Edelman opened its office in Warsaw in 2005, shortly after Poland joined the EU. According to the website of the Poland office, the work handled there has been an "even mix of Polish and international companies". It also acts as the agency’s central European hub, the website says.
The action in Poland follows Edelman’s retrenchment in Russia and Turkey.
Last year, the agency closed its Russian operation, saying the economic situation in the country had made business "increasingly difficult".
PRWeek then reported last month that Edelman is to pull out of its wholly owned operation in Turkey, with Stewart citing the "unbelievably complicated" geopolitical situation in the country.
Edelman is moving to an affiliate relationship in Russia, and to what it calls an "affiliate plus" model in Turkey, with Edelman retaining a minority stake in the firm, and general manager Serra Turk Buyukfirat becoming the majority shareholder.
Speaking to PRWeek last year, Stewart said Edelman could scale back operations in some parts of Europe, alongside strategic acquisitions in the continent.