Mississippi Valley Mayhem (MVM) is a women's flat track roller derby league based in La Crosse, Wisconsin.

Mississippi Valley is a member of the Women's Flat Track Derby Association (WFTDA).

[1] The Mayhem was founded in August 2008 by two local women, Amanda Boucher and Stephanie Powers, after Boucher encountered the sport on a visit to Austin, Texas.

[3] The league was accepted into the Women's Flat Track Derby Association Apprentice Program in January 2010,[4] and it graduated to full membership in December 2012.

[5] In May 2011, one of its practice venues, the Green Island Ice Arena, was severely damaged by a tornado.