Toxic sludge spill

Toxic sludge spill may refer to:
 * Ajka alumina plant accident, in Ajka, Hungary on 4 October 2010.
 * Kingston Fossil Plant coal fly ash slurry spill, in Roane County, Tennessee, United States on 21 December 2008.
 * Martin County sludge spill, in Martin County, Kentucky, United States on 11 October 2000.