Filbert can mean the following:
- Corylus maxima, a species of hazelnut
- Filbert is an alternate name for a hazelnut
- Filbert, South Carolina
- Filbert, West Virginia
- Filburt, a character of the TV show Rocko's Modern Life
- Filbert paintbrush, a type of artist's brush that has an ovoid tip which resembles a hazelnut