The Greater Poland Civil War () refers to the conflict that took place during 1382–1385 in the Greater Poland province of the Kingdom of Poland. Another name for the conflict is the Grzymała-Nałęcz Family War (), as a major part of the conflict involved the struggle between the Grzymała coat-of-arms and Nałęcz coat-of-arms families (clans) for the dominant position in the Greater Poland.