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In telecommunication, a non-return-to-zero (NRZ) is a code in which "1s" are represented by one significant condition and "0s" are represented by another, with no neutral or rest condition, such as a zero amplitude in amplitude modulation (AM), zero phase shift in phase-shift keying (PSK), or mid-frequency in frequency-shift keying (FSK).

For a given data signaling rate, i.e., bit rate[?], the NRZ code requires only one-half the bandwidth required by the Manchester code.

Contrast with Manchester code, return-to-zero[?].

Source: from Federal Standard 1037C in support of MIL-STD-188

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