Hazelnut or Filbert?

Is it a hazelnut or a filbert?

Hazelnuts and filberts are the same nuts, but they have different names depending on the region. In the United States, they’re commonly called hazelnuts at retail, but they are also correctly referred to as filberts. The terms are used interchangeably, and both refer to the nuts from the Corylus avellana tree. So, whether you call it a hazelnut or a filbert, you are talking about the same delicious and nutritious nut!