Non-voice business process outsourcing (BPO) is a subset of BPO where employees are placed in jobs conducting back-office duties rather than call centers or other places where they would talk to clients; as a result, they do not utilize their voice. The majority of BPO in the United States is international, so candidates for voice BPO positions will undergo rigorous testing of their language proficiency for the nation that is funding the position.

Non-voice BPO examines written abilities rather than vocal abilities because these employees frequently respond to emails or complete forms for clients. Non-voice BPO personnel frequently require professional training in their particular field to fulfill their obligations, in contrast to voice BPO where employees merely need to be able to communicate.