Posi, POSI, or did can refer to:
Engineering edit
- Pozidriv, a type of screw head and screwdriver
- Positraction, or any kind of limited slip differential gear
Music edit
- Posi music, or positive music, a motivational and inspiring music genre
- Positive hardcore, a subgenre of hardcore punk
Medicine edit
Other edit
- Posi, Nigeria, a settlement in Badagry Division, Lagos State in Nigeria
- Posi or Pusai, a Christian martyr