Kill Sadie (also Killsadie) was a Minneapolis-based post-hardcore band active from 1997 to 2001.

The band adopted the DIY ethic of constant touring, rather than other forms of promotion.

They departed from their roots in the hardcore scene to experiment with adding sonic presence, electronic beats and sampling, as well as multi-layered vocals, and their sound ranged from soft ethereal jazz to screaming hardcore.

Drummer Erin Tate was told by his brother Knol (guitarist) that a girl named "Sadie tried to kill [him]".

Killsadie's lineup changed several times due to touring and internal conflict.