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The expected rate for Multiple Parton Interactions (MPI) at the LHC is large.This requires an estimate of their impact on all measurement foreseen at theLHC. Conversely it provides new means of studying MPI at the LHC. In this paperwe examine the role of MPI at the LHC, with the design energy of 14 TeV, in - Zproduction in association with four jets, - W\pm W\pm in association with zeroor two jets. -W+ W- in association with two jets. In all cases the vectorbosons are assumed to decay leptonically.  The MPI contribution to Z+4j is dominated by events with two jets withbalancing transverse momentum. It is possible to achieve a good signal tobackground ratio, close to 20%, for MPI compared to Single Interactionprocesses by selecting events with two jets with large separation in thetransverse plane. The corresponding statistical significance for a luminosityof 1 inverse fb is about 6.9 for the mu+mu- channel alone.  The final state channel in which only two same-sign high transverse momentumcharged leptons are required and additional hard jets are vetoed is dominatedby MPI, with an expected yield of 2500 events with the full LHC luminosity.

Multiple Parton Interactions in Z+4j, W\pm W\pm +0/2j and W+ W- +2j production at the LHC