Moshing (also known as slam dancing or simply slamming) is an extreme style of dancing in which participants push or slam into each other, typically performed to "aggressive" live music such as heavy metal and punk rock. Moshing usually happens in the center of the crowd, generally closer to the stage, in an area called the "mosh pit". It is intended to be energetic and full of body contact.

The dance style originated in the hardcore punk scenes of California and Washington, D.C., around 1980. Through the 1980s it spread to other branches of punk rock as well as grunge and thrash metal, which exposed it to the mainstream. Since then, moshing has occasionally been performed to energetic music within a wide variety of genres, including alternative rock, electronic dance music and hip hop, while remaining a staple in heavy metal shows.

Variations of moshing exist, including "pogoing", "circle pits", and "wall of death". Dancing can be done alone as well as in groups.

While moshing is seen as a form of positive fan feedback or expression of enjoyment, it has also drawn criticism over dangerous excesses in its violence. Injuries and even deaths have been reported in the crush of mosh pits.