mIRC is an Internet Relay Chat (IRC) client for Microsoft Windows, created in 1995 and developed by Khaled Mardam-Bey. Although it is a fully functional chat utility, its integrated scripting language makes it extensible and versatile.

mIRC has been downloaded over twenty-three million times from CNET's service. Nielsen//NetRatings also ranked mIRC among the top ten most popular Internet applications in 2003.

It is unknown if the "m" in mIRC stands for anything (the author's personal FAQ explains that "it quite possibly stands for 'moo', or perhaps even MU"). The author pronounces it "m-I-R-C", or "mirk" for short.