Biochar is the carbonaceous residue produced from pyrolytic conversion of biomass. Biochar is generally used for agricultural application as soil amendment without exploiting its full potentiality. This brief overview aims to present the use of biochar as filler for the production of reinforced and conductive composites. This study reports an up‐to‐date description of the most recent achievements reached in the field of both thermosetting and thermoplastic composites.