Milli- is the SI prefix for one thousandth (10−3, symbol m)
Milli may also refer to:
- Milli (rapper) (born 2002), Thai rapper
- Milli, a character in Team Umizoomi
- Birinci Milli, a village in Azerbaijan, also known as Milli
- "A Milli", a 2008 song by Lil Wayne
- Milli Bus, a government-run bus service operating across Afghanistan
- Milli Fire, wildfire in Oregon forest during the summer of 2017