  These lectures begin with a brief introduction to the minimal supersymmetric
standard model (MSSM) and the various mechanisms for hidden sector
supersymmetry breaking and go on to provide a pedagogical discussion of the
various kinds of supersymmetric unified theories beyond the MSSM including SUSY
GUTs. Their implications for proton decay, R-parity violation, doublet triplet
splitting etc. are discussed. Exhaustive discussion of SU(5) and SO(10) models
is given. Other GUT models such as those based on $E_6$, $SU(5)\times SU(5)$,
flipped SU(5) and SU(6) are also presented.
