Abbreviation for Monsieur?
The abbrevation for monsieur is simply M.
== == The French equivalent of mister is monsieur, which is abbreviated M. (including a period). Note: The abbreviations Mme (madame) and Mlle (mademoiselle) do not use periods because they end with the final letters of the full words. However, M. does use a period since it does not end with r, the final letter of monsieur.