We summarize the status of heavy gauge boson (Z’) diagnostics at future hadron and e+e- colliders. The emphasis is on the model independent determination of gauge couplings of Z’ to quarks and leptons at the pp (CERN LHC) and e+e- (NLC) colliders. For MZ’ ~1 TeV, the NLC would have a capability to probe all the quark and lepton charges to around 10-20%, provided heavy flavor tagging and longitudinal polarization of the electron beam is available. On the other hand, at the LHC primarily the magnitude of normalized couplings can be determined, with typical uncertainties by about a factor of 2 smaller, however, still comparable to the ones at the NLC. The complementarity between the diagnostic power of the two types of machines is emphasized.
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