  We present the currently most precise W boson mass (M_W) prediction in the
Minimal Supersymmetric Standard Model (MSSM) and discuss how it is affected by
recent results from the LHC. The evaluation includes the full one-loop result
and all known higher order corrections of SM and SUSY type. We show the MSSM
prediction in the M_W-m_t plane, taking into account constraints from Higgs and
SUSY searches. We point out that even if stops and sbottoms are heavy,
relatively large SUSY contributions to M_W are possible if either charginos,
neutralinos or sleptons are light. In particular we analyze the effect on the
M_W prediction of the Higgs signal at about 125.6 GeV, which within the MSSM
can in principle be interpreted as the light or the heavy CP-even Higgs boson.
For both interpretations the predicted MSSM region for M_W is in good agreement
with the experimental measurement. We furthermore discuss the impact of
possible future LHC results in the stop sector on the M_W prediction,
considering both the cases of improved limits and of the detection of a scalar
top quark.
