Alcázar wani nau'i ne na gidan sarauta ko fada a Spain da Portugal da aka gina a lokacin mulkin musulmi ko da yake ana amfani da kalmar don yawancin katangar zamanin da kiristoci suka gina a farkon katangar Roman, Visigothic ko Moorish. Yawancin alcázars an gina su ne tsakanin ƙarni na 8 zuwa na 15. Ana amfani da kalmar akai-akai azaman ma'ana ga castillo ko castle; Fadojin da sarakunan Kirista suka gina kuma galibi ana kiransu alcázars. Kalmar Mutanen Espanya alcázar (lafazi:[alˈkaθaɾ]) ta samo asali ne daga kalmar Larabci wato القصر al-qaṣr "kagara, kagara, ko fada", wanda kuma ya samo asali daga kalmar Latin Castrum ("sansanin soja", "sansanin soja"). Irin waɗannan kalmomi suna wanzu a cikin Galician (alcázar, lafazin [alˈkaθɐɾ]), Portuguese (alcácer, lafazin [ɐɫˈkasɛɾ]), da Catalan (alcàsser, lafazin [əlˈkasəɾ]). Spain kuma tana da kagaran Moorish da aka sani da alcazabas (القصبة al-qasbah). Duk da haka, ba duk ƙauyuka a Spain ake kira alcázar ba: yawancin ana kiran su castillo a cikin Mutanen Espanya ko castell a Catalan.