Apache OpenOffice (AOO) babban buɗaɗɗen kayan aikin software ne na ofis. Yana ɗaya daga cikin ayyukan magaji na OpenOffice.org da wanda aka zaɓa na IBM Lotus Symphony. Kani ne na kusa da LibreOffice da NeoOffice. Ya ƙunshi na'ura mai sarrafa kalmomi (Marubuci), maƙunsar rubutu (Calc), aikace-aikacen gabatarwa (Impress), aikace-aikacen zane (Zana), editan ƙididdiga (Math), da aikace-aikacen sarrafa bayanai (Base). Tsarin fayil ɗin tsoho na Apache OpenOffice shine Tsarin OpenDocument (ODF), daidaitaccen ISO/IEC. Hakanan yana iya karantawa da rubuta nau'ikan nau'ikan fayilolin fayil iri-iri, tare da kulawa ta musamman ga waɗanda daga Microsoft Office - ko da yake, ba kamar LibreOffice ba, ba zai iya adana takardu a cikin Microsoft's post-2007 Office Open XML Formats, amma shigo da su kawai.