Complexation of a boron atom with a series of bidentate heterocyclic ligands successfully gives rise to corresponding BF2‐chelated heteroarenes, which could be considered as novel boron(III)‐cored dyes. These dye molecules exhibit planar structures and expanded π‐conjugated backbones due to the locked conformation with a boron center. The geometric and electronic structures of these BF2 complexes can