  Ultraviolet renormalons, contrary to their infrared counterparts, lead to a
universal contribution to the large-order behaviour of perturbative expansions
in QCD. In this letter, we determine nature of the leading ultraviolet
renormalon singularity for the inclusive hadroproduction cross section in $e^+
e^-$ annihilation, for hadronic $\tau$ decays and the moments of deep-inelastic
scattering structure functions. We comment on the relevance of ultraviolet
renormalons to estimates in low orders of perturbation theory.
