We examine, as model-independently as possible, the production of bileptons
at hadron colliders. When a particular model is necessary or useful, we choose
the 3-3-1 model. We consider a variety of processes: q anti-q -> Y^{++} Y^{--},
u anti-d -> Y^{++} Y^{-}, anti-u d -> Y^+ Y^{--}, q anti-q -> Y^{++} e^{-}
e^{-}, q anti-q -> phi^{++} phi^{--}, u anti-d -> -> phi^{++} phi^{-}, and
anti-u d -> phi^{+} phi^{--}, where Y and phi are vector and scalar bileptons,
respectively. Given the present low-energy constraints, we find that at the
Tevatron, vector bileptons are unobservable, while light scalar bileptons
(M_phi <= 300 GeV) are just barely observable. At the LHC, the reach is
extended considerably: vector bileptons of mass M_Y <= 1 TeV are observable, as
are scalar bileptons of mass M_phi <= 850 GeV.Comment: 20 pages (LATEX), 7 figures, minor modification
