TMX

TMX may refer to:


 * TMX Group, owner of Toronto Stock Exchange and Montreal Derivatives Exchange
 * Toronto Stock Exchange (TSX)
 * Montreal Exchange (MX)
 * Telmex, NYSE ticker symbol
 * Tesla Model X, battery electric mid-size luxury crossover SUV
 * Translation Memory eXchange file format
 * Transaction Management eXecutive, old NCR system
 * Tickle Me Elmo, a Sesame Street doll
 * Kodak T-MAX 100 film edge marking
 * Tandem Mirror Experiment
 * TMX Finance, US company
 * Tamoxifen, breast cancer medication
 * Trans Mountain Expansion Project in Trans Mountain Pipeline
 * Transmashholding (ТМХ), a Russian rolling stock manufacturing company
 * Honda Tricycle Motor Extreme, a line of Motorcycles in the Philippines