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We investigate multilepton signatures, arising from the decays of doublycharged and singly charged Higgs bosons in the Type-II Seesaw model. Dependingon the vacuum expectation value of the triplet $v_{\Delta}$, the doubly andsingly charged Higgs bosons can decay into a large variety of multi-leptonfinal states. We explore all possible decay modes corresponding to differentregimes of $v_{\Delta}$, that generate distinguishing four and five leptonicsignatures. We focus on the 13 TeV Large Hadron Collider (LHC) and furtherextend the study to a very high energy proton-proton collider (VLHC) with acenter-of-mass energy of 100 TeV. We find that a doubly charged Higgs boson ofmasses around 375 GeV can be discovered at immediate LHC runs. A heavier massof 630 GeV can instead be discovered at the high-luminosity run of the LHC orat the VLHC with 30 $\rm{fb}^{-1}$.

Type-II Seesaw Model and Multilepton Signatures at Hadron Colliders