  In a recent re-analysis of the Standard Model (SM) beta-function for the
effective neutrino mass operator, we found that the previous results were not
entirely correct. Therefore, we consider the analogous dimension five operators
in a class of Two Higgs Doublet Models (2HDM's) and the Minimal Supersymmetric
Standard Model (MSSM). Deriving the renormalization group equations for these
effective operators, we confirm the existing result in the case of the MSSM.
Some of our 2HDM results are new, while others differ from earlier
calculations. This leads to modifications in the renormalization group
evolution of leptonic mixing angles and CP phases in the 2HDM's.
