Xm or XM may refer to:

• XM Satellite Radio, a US and Canadian radio company now merged into Sirius XM Holdings.
• XM (file format), a computer file format for music
• XM (album), a live-in-studio album recorded by Porcupine Tree
• BMW XM, an full-size luxury performance SUV made by BMW
• Citroën XM, a discontinued executive car made by Citroën
• C.A.I. First or Alitalia Express (IATA code XM, 1997-2005), an Italian airline
• A nonstandard Roman numeral for 990 (standard is CMXC)
• (6903) 1989 XM, a main belt minor planet
• Cross-matching of blood products

• All pages with titles beginning with XM Includes several weapons and other military hardware
• All pages with titles containing XM Includes many shows broadcast on XM