Warsaw police say they are searching for attackers who have smashed windows in the city's Center of Muslim Culture.
Warsaw police spokesman Mariusz Mrozek said CCTV monitoring was being reviewed and has appealed for people who might have any information about the attack to come forward.
Warsaw's Muslim community has a few thousand members.
Acts of hatred and xenophobia are being reported more frequently in Poland since the Law and Justice party came to power two years ago. The government promotes Catholicism and refuses to take in non-Catholic refugees as part of an EU relocation plan.