  We present a supersymmetric realization of the twin Higgs mechanism, which
cancels off all contributions to the Higgs mass generated above a scale f.
Radiative corrections induced by the top quark sector lead to a breaking of the
twin sector electroweak symmetry at a scale f ~ TeV. In our sector, below the
scale f, these radiative corrections from the top quark are present but greatly
weakened, naturally allowing a Z boson mass an order of magnitude below f, even
with a top squark mass of order 1 TeV and a messenger scale near the Planck
mass. A sufficient quartic interaction for our Higgs boson arises from the
usual gauge contribution together with a radiative contribution from a heavy
top squark. The mechanism requires the presence of an SU(2)-adjoint superfield,
and can be simply unified. Naturalness in these theories is usually associated
with light winos and sleptons, and is largely independent of the scale of the
colored particles. The assumption of unification naturally predicts the
existence of many exotic fields. The theory often has particles which may be
stable on collider timescales, including an additional color octet superfield.
In the limit that m_SUSY >> f, the mechanism yields a UV completion of the
non-supersymmetric twin Higgs, but with the notable improvement of a tree-level
quartic for the standard model Higgs. In this framework, a successful UV
completion requires the existence of new charged fields well below the scale f.
