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We investigate possible symmetry properties of the scalar sector ofMulti-Higgs-Doublet Models, and, to some extent, the generalization of suchmodels to gauge groups other than $SU(2)_L\times U(1)_Y$. In models where the${\cal C}$ (charge conjugation) violating operator $\hat{C}$ is not present,the scalar potential is invariant under a group larger than the gauge group,O(4) when the Higgs fields are doublets. If the Higgs fields develop alignedvacuum expectation values, this symmetry will break to an O(3) subgroup, whichin general is further broken by loop corrections involving the gauge bosons.Assuming such corrections are small, the physical properties of the Higgssector will approximately organize into representations of SO(3). If the vacuumexpectation values of the Higgs fields are aligned in the direction of the${\cal C}$ even fields, the mass spectra of the charged and ${\cal C}$ oddsectors will be degenerate. Moreover, if the Higgs fields develop a pair ofnon-aligned vacuum expectations values, so that the charge conjugation symmetryis spontaneously broken (but not the U(1) electromagnetic gauge invariance), apair of light charged Higgs bosons should appear.

Symmetry and Mass Degeneration in Multi-Higgs-Doublet Models