  We study $R$-parity violation in the framework of GUTs, focusing on the case
that $R$-parity is broken exclusively through $\Delta B=1$, $\Delta L=0$
effective interactions. We construct two such models, an $SU(5)$
  and an $SU(5)\times U(1)_{X}$ model, in which $R$-parity breaking is induced
through interactions with extra supermassive fields. The presence of only the
Baryon Number violating operators ${d^c}{d^c}{u^c}$ requires an asymmetry
between quarks and leptons, which is achieved either by virtue of the Higgs
representations used or by modifications in the matter multiplets. The latter
possibility is realized in the second of the above models, where the
left-handed leptons have been removed from the representation in which they
normaly cohabit with the right-handed up quarks and enter as a combination of
the isodoublets in $(\bf {{\overline{5}},-3})$ and $(\bf {5,-2})$
representations. In both models the particle content below the GUT scale is
unaffected by the introduced $R$-parity breaking sector.
