Project 25, P25, or APCO-25 is the national standard for the design and production of digital two-way radios used by first responders and public safety officials.

Originally developed in North America by the Telecommunications Industry Association in collaboration with local, regional, and national government representatives, the P25 standard has gained widespread global acceptance for use across all public safety sectors.

P25 is important because it enables interoperable emergency communications among all public safety personnel through standardization. Access to mission-critical communication networks forms the foundation for ensuring community and national security. Before the P25 standard was established, multiple protocols and varying public safety frequency spectrums made interoperability between different agencies difficult.