War orphan was a term for children who were orphaned or abandoned in the wake of a conflict.
Many Cardassian children were abandoned on Bajor in the wake of the occupation. Some Bajorans accepted these children, such as Rugal and Asha, as they did not blame the children for the misdeeds of the Cardassian government. (DS9: "Cardassians")
The term also applied to Bajoran children whose parents had died during the occupation. A charitable fund, the Bajoran War Orphans Fund, was established to help provide for the numerous orphans that were a legacy of the Occupation, both Bajoran and Cardassian alike. (DS9: "Necessary Evil", "Rivals", "Ferengi Love Songs", "In the Cards", DS9: "The Jem'Hadar")
The Federation-Cardassian War left war orphans behind on Camor V. (TNG: "Bloodlines")