My Google-fu has maybe failed me, but I couldn't find an authoritative source about the correct English qualification title for a French diplôme d'ingénieur.
Some sources say the title is M.Sc., others MEng., so I'm not sure which one suits it best.
Best Answer
The most generic term which would be understood in the majority of English speaking academic circles is a Masters of Engineering. The names can vary enormously depending on the institution offering the degree, but most people should understand Masters of Engineering. Some examples:
Harvard
MIT
Oxford
Cambridge