HTX may refer to: Hashitoxicosis Heart transplantation Heat exchanger Hemitoxin Higher Technical Examination Programme of the Danish educational system Home Team Science and Technology Agency, a statutory board in the Singapore government focusing on science and technology in public security Homothorax Houston, Texas, United States Middle Hittite language, an extinct language of Anatolia ZIC3, a protein HyperTransport Expansion connector, part of the HyperTransport specification