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[en] We search for the flavor-changing neutral current decays D0→μ+μ- and D0→e+e-, and for the lepton-flavor violating decays D0→e±μ± using 660 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find no evidence for any of these decays. We obtain significantly improved upper limits on the branching fractions: B(D0→μ+μ-)<1.4x10-7, B(D0→e+e-)<7.9x10-8, and B(D0→e+μ-)+B(D0→μ+e-)<2.6x10-7 at 90% confidence level.