The pair production cross section for scalar and vector leptoquarks at ep
colliders is calculated for the case of photon--gluon fusion. In a model
independent analysis we consider the most general C and P conserving
couplings of gluons and photons to both scalar and vector leptoquarks described
by an effective low--energy Lagangian which obeys U(1)em×SU(3)c
invariance. Numerical predictions are given for the kinematical regime at HERA
and LEP~⊗~LHC.Comment: 15 p., postscript encoded with uufiles; DESY 94--07