IMX may refer to:

• IMX (TV series), or Interactive Music Exchange, an American music television program from 2003-04
• IMx, an American R&B group, also known as Immature
  • IMx (album), 2001 album
• i.MX, a family of Freescale Semiconductor proprietary microprocessors
• IMX Resources, a dual-listed iron ore mining and base and precious metals exploration company based in Perth, Western Australia
• IMX-101, a high-performance insensitive explosive
• MPEG IMX, a digital video format for Betacam
• Zimex Aviation, an airline based in Glattbrugg, Switzerland, by ICAO code

Immature (also known as IMx) is an American R&B group, managed by record producer Chris Stokes. Its members include Marques "Batman" Houston (born August 4, 1981), Jerome "Romeo" Jones (born October 25, 1981), and Kelton "LDB" Kessee (born January 27, 1981), all natives of Los Angeles, California, where the group was formed. The group released four albums under the Immature moniker including On Our Worst Behavior in 1992 which included former member Don "Half Pint" Santos, later replaced by Kessee, Playtyme Is Over in 1994, then We Got It in 1995 and finally in 1997 released the album, The Journey.