  We consider extensions of the standard model based on open strings ending on
D-branes, with gauge bosons due to strings attached to stacks of D-branes and
chiral matter due to strings stretching between intersecting D-branes. Assuming
that the fundamental string mass scale is in the TeV range and the theory is
weakly coupled, we discuss possible signals of string physics at the Large
Hadron Collider (LHC). In such D-brane constructions, the dominant
contributions to full-fledged string amplitudes for all the common QCD parton
subprocesses leading to dijets are completely independent of the details of
compactification, and can be evaluated in a parameter-free manner. We make use
of these amplitudes evaluated near the first resonant pole to determine the
discovery potential of LHC for the first Regge excitations of the quark and
gluon. Remarkably, the reach of LHC after a few years of running can be as high
as 6.8 TeV. Even after the first 100 pb^{-1} of integrated luminosity, string
scales as high as 4.0 TeV can be discovered. For string scales as high as 5.0
TeV, observations of resonant structures in pp \to {\rm direct} \gamma + jet
can provide interesting corroboration for string physics at the TeV-scale.
