Résumé : The search in DELPHI data for neutral Higgs bosons is described. No candidate for the Standard Model Higgs is seen in Z0 decays to H0νν, H0μ+μ- or H0τ+τ- after selections that proved efficient for finding simulated H0. One remaining candidate for Z0 → H0e+e- is consistent with background. Together with our earlier studies, these results restrict the H0 mass to be above 38 GeV/c2 at the 95% confidence level. No signal is found for decays of Minimal Supersymmetric Standard Model neutral Higgs bosons to τ+τ-. Limits are obtained for their decays to produce four jets. © 1992.