  A review of the current status of nucleon stability in SUSY unified models is
given. The review includes analysis of nucleon stability in the minimal SU(5)
supergravity model, and in extensions of the minimal model such as SO(10)
models, and models including textures. Implications of the simultaneous
constraint of the experimental limit on the proton lifetime and the constraint
that dark matter not overclose the universe are also discussed.
