Apache OpenOffice (AOO) jẹ ẹya-ìmọ-orisun ọfiisi software suite. O jẹ ọkan ninu awọn iṣẹ aṣeyọri ti OpenOffice.org ati arọpo ti a yan ti IBM Lotus Symphony. O jẹ ibatan ibatan ti LibreOffice ati NeoOffice. O ni ero isise ọrọ kan (Onkọwe), iwe kaakiri (Calc), ohun elo igbejade (Iminu), ohun elo iyaworan (Fa), olootu agbekalẹ (Math), ati ohun elo iṣakoso data (Ipilẹ). Ọna kika faili aiyipada ti Apache OpenOffice jẹ Ọna kika OpenDocument (ODF), boṣewa ISO/IEC kan. O tun le ka ati kọ ọpọlọpọ awọn ọna kika faili miiran, pẹlu akiyesi pataki si awọn ti Microsoft Office - botilẹjẹpe, ko dabi LibreOffice, ko le fi awọn iwe aṣẹ pamọ ni awọn ọna kika XML Office Office ti post-2007 Microsoft, ṣugbọn gbe wọn wọle nikan.