  We study the signals for supersymmetry at the Tevatron and DiTevatron
($\sqrt{s}=4\TeV$) in various well-motivated supersymmetric models. We consider
the trilepton signature in the decay of pair-produced charginos and
neutralinos, the missing energy signature in gluino and squark production, and
the $b\bar b$ signal in the decay of the lightest supersymmetric Higgs boson
produced in association with a $W$ or $Z$ boson. In each case we perform signal
and background studies, using Monte Carlo and/or real data to estimate the
sensitivity to these signals at the Tevatron and DiTevatron with the Main
Injector, for short- and long-term integrated luminosities of ${\cal L}=10$ and
$25\ifb$, and $5\sigma$ statistical significance. We conclude that one could
probe chargino masses as high as $m_{\chi^\pm_1}\sim180\,(200)\GeV$, gluino
masses as high as $m_{\tilde g}\sim450\,(750)\GeV$, and lightest Higgs boson
masses as high as $m_h\sim110\,(120)\GeV$ at the Tevatron (DiTevatron). A
high-luminosity option at the Tevatron ($10^{33}\cm^{-2}\s^{-1}$) may
compensate somewhat for the higher reach of the DiTevatron, but only in the
trilepton and Higgs signals. However, these gains may be severely compromised
once the multiple-interaction environment of the high-luminosity Tevatron is
accounted for.
