Leptonic B decays at BaBar

We will present the most recent results on leptonic B decays $B^{\pm(0)} \to K^{* \pm (0)} ν\barν$ and $B^{\pm} \to μ^{\pm} ν$, based on the data collected by the BaBar detector at PEP-II, an asymmetric $e^+ e^-$ collider at the center of mass energy of the $Υ(4S)$ resonance .