Barium titanate (BaTiO 3 ) is a perovskite crystal, which is transparent over a wide spectral range and has a high refractive index. BaTiO 3 is a suitable building block for metamaterials or photonic devices. In addition, BaTiO 3 emits a strong second harmonic generation (SHG) signal due to its noncentrosymmetric crystal structure. SHG in nanostructures has potential applications in bio-imaging and lab-on-a-chip applications. BaTiO 3 nanoparticles emit a strong bulk SHG signal [1] and are biocompatible. However, SHG decreases strongly with the volume of the nanostructures and means to increase the conversion efficiency are currentìy being investigated. Here, we demonstrate that the conversion efficiency to SHG is strongly enhanced by means of the Mie resonance [2] of an individual BaTiO 3 nanoparticle.