网络语音协定（英语：Network Voice Protocol，缩写：NVP）为电脑网络协定中，借由封包化的通信网络发送人类的话语的先驱。因此，网络语音协定可视为今日VoIP技术的始祖。

网络语音协定最早于1973年由南加州大学信息科学研究院的网络研究员Danny Cohen所实作，其研究资金来自美国高等研究计划署(ARPA)的网络安全通信计划(Network Secure Communications program)。计划目标(参见1977年发表的IETF RFC 741)为发展及展示借由封包交换的电脑通信网络进行安全、高品质、低带宽、即时、全双工数字声音通信的可行性，此外并借由现有的加密器材来保护其中内容。而此研究的最主要目标是展示同时具备数字化的高品质、低带宽、以及具有加密语音处理的能力，以满足一般军事需求中全球加密语音通信的部分。

The Network Voice Protocol (NVP) was a pioneering computer network protocol for transporting human speech over packetized communications networks. It was an early example of Voice over Internet Protocol technology.

NVP was first implemented in December 1973 by computer networking researcher Danny Cohen of the Information Sciences Institute (ISI), University of Southern California, with funding from ARPA's Network Secure Communications (NSC) program. The project's stated goals as stated in IETF RFC 741, published 1977, were "to develop and demonstrate the feasibility of secure, high-quality, low-bandwidth, real-time, full-duplex (two-way) digital voice communications over packet-switched computer communications networks.... [and to] supply digitized speech which can be secured by existing encryption devices. The major goal of this research is to demonstrate a digital high-quality, low-bandwidth, secure voice handling capability as part of the general military requirement for worldwide secure voice communication."