The survey was conducted by the European Union's Agency for Fundamental Rights. Its release Friday was timed to coincide with the 75th anniversary of the Kristallnacht pogroms in Nazi Germany.
Among the findings: 34 percent of poll respondents in Sweden and 29 percent in France said they never wear a Star of David or anything else that could signal their religion.
The Agency for Fundamental Rights said 5,847 self-identified Jews were surveyed in eight Western European countries. It said its findings aim to provide guidance on measures to take against anti-Semitism.