How do you abbreviate mister in Italian?

The abbreviation for "Mister" in Italian is Sig., which stands for Signor.

Here's how to use it:

* Sig. Rossi (Mr. Rossi)

It's important to note that "Sig." is a formal abbreviation. In informal contexts, you can use "Signor" in full, or even omit the title altogether, especially when addressing someone you know well.