Résumé : First results on inclusive {Mathematical expression} and D*± production in neutral current deep inelastic ep scattering are reported using data collected by the H1 experiment at HERA in 1994. Differential cross sections are presented for both channels and are found to agree well with QCD predictions based on the boson gluon fusion process. A charm production cross section for 10 GeV2≤Q2≤100 GeV2 and 0.01≤y≤0.7 of {Mathematical expression} is derived. A first measurement of the charm contribution {Mathematical expression} to the proton structure function for Bjorken x between 8·10-4 and 8·10-3 is presented. In this kinematic range a ratio {Mathematical expression} is observed. © 1996 Springer-Verlag.