A civil war was a war in within an individual state or within one species.
For a war involving one species, the species had to have encountered another alien species.
Known Civil Wars
- English Civil War
- American Civil War
- Spanish Civil War
- Great Civil War - a conflict between the Daleks loyal to the Emperor Dalek and humanised Daleks "infected" with the Human Factor. (DW: The Evil of the Daleks)
- Imperial-Renegade Dalek Civil War - a conflict between the Renegade Daleks loyal to the Supreme Dalek and the Imperial Daleks loyal to Davros. (DW: Revelation of the Daleks, Remembrance of the Daleks)