CX or Cx may stand for:

• Cx, the letter in the Esperanto alphabet
• Categorical exclusion (US government)
• the IATA code for Cathay Pacific Airways
• Fuji Television - A Japanese TV network in Odaiba, Tokyo, Japan - JOCX-TV, JOCX-DTV
• Christmas Island (ISO 3166-1 alpha-2)
• Circumflex artery
• Composite signaling
• Cross-examination (debate)
• Phosgene oxime
• Citroen CX, a French automobile model.
• in Roman numerals, the number 110.
• .cx the domain for Christmas Island