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It has been shown that the Cabibbo angle can be predicted in terms of grouptheoretical quantities, if the dihedral group D14 plays the role of a flavorsymmetry. We extend a supersymmetric D14 model to the lepton sector and showthat theta^nu_13 and the deviation of theta^nu_23 from maximal mixing in theneutrino sector originate, similar to the Cabibbo angle in the quark sector,from a mismatch of different subgroups of D14 and are of the size of theCabibbo angle. The mixing angles in the charged lepton sector are small. Thus,the lepton mixing angle theta^l_13 is naturally in its experimentally preferredrange and theta^l_23 within its 3 sigma range. The solar mixing angle is oforder one and the charged lepton mass hierarchy is correctly reproduced.Leading order results are only slightly perturbed, if next-to-leading ordercorrections are taken into account.

D14 - A Common Origin of the Cabibbo Angle and the Lepton Mixing Angle theta^l_13