Apache OpenOffice，又称OpenOffice、AOO，原称为OpenOffice.org，是一套开放源代码的办公室软件，可以在多种操作系统上运作。缺省的文档交换格式是已经成为ISO标准的开放文档格式（ODF，OpenDocument Format），此外也支持Microsoft Office 97至2016的文档格式，以及其余常见的文档文件。在转交Apache软件基金会前，软件通常称为「OpenOffice」或简称「OOo」，但因为商标的争议，正规的叫法是「OpenOffice.org」。

Apache OpenOffice (AOO) is an open-source office productivity software suite. It is a successor project of OpenOffice.org and integrates features and improvements from IBM Lotus Symphony. Apache OpenOffice is a close cousin of LibreOffice and NeoOffice. It contains a word processor (Writer), a spreadsheet (Calc), a presentation application (Impress), a drawing application (Draw), a formula editor (Math), and a database management application (Base).