  Precision measurements of the Higgs mass have become a powerful constraint on
models of physics beyond the standard model. We revisit supersymmetric models
with Dirac gauginos and study the contributions to the Higgs mass. We calculate
the leading two-loop corrections to the SM-like Higgs mass by constructing a
series of EFTs and iteratively integrating out heavy particles. We then apply
these calculations to a variety of scenarios, including a simple Dirac gluino,
and split Dirac models of supersymmetry. We present the detailed formulae for
threshold corrections and compare with previous results, where available. In
general, the contributions are small, but the additional precision allows us to
make more concrete statements about the relevant scales in Dirac SUSY models.
