Contact lens, in Hong Kong english;
Confidence trick, also known as a con, scam, or flim flam
A con artist, or one who performs a confidence trick;
;
A short form of the name Constantine;
Conference or Convention (meeting)
Fan convention. Many fan conventions include the word "con" in a clever (or not-so-clever) pun in their name, e.g. ConVergence.;
;
Convict, as in ex-con;
Con (TV series), secrets of the con artist revealed;
Conning tower;
Certificate of Need (CON);
Commander of the Order of the Niger (CON);
Italian for "with," in musical directions; see musical terminology.;
An abbreviation for Contrary;
Cornwall in England — CON is the Chapman code for that county.;
In Unitarian Universalist communities short for "Youth Conference".;