MML is a music description language used in sequencing music on a number of computer and video game system platforms. It's basically a text file which can be compiled into a native music file for a video game console.

Several dialects of MML exist:

- MCK (NES/Famicom 2A03 only)
- PPMCK (NES/Famicom 2A03 + expansions)
- XPMCK (various chips/computers/consoles)
- Professional Music Driver (PMD) (PC-x801 YM2608 and YM2203)