On this page of the guide you will find out what languages are available in NieR Automata. Different languages are available as subtitles and as dubbing in Nier Automata.
NieR Automata offers many different language versions. Make sure to choose the one that you can easily understand. The plot of NieR Automata is quite complex and a lot of information is discovered from various notes found throughout the game or from longer conversations with other characters. If you don't set the language to your preferences, you may find it difficult to navigate through some of the menu windows that contain e.g. extensive statistics and object descriptions, or various abbreviations that can may be hard to decipher.
You can select a language from the main menu in the Language tab. Here are all the available subtitles languages in NieR Automata:
The game also features dubbing. It is only supported for two languages: