NTT may refer to:*Nippon Telegraph and Telephone, a telephone company that dominates the telecommunication market in JapanIts group companies can be found at Name That Tune, a now defunct game showNew Technology Telescope, a 3.6m telescope located at La Silla Observatory, ChileGiant Robot (Giant Robot album), an album by the band Giant Robot and recording company NTT RecordsNumber theoretic transform, a mathematical transform similar to the Discrete Fourier transform… (More on Ntt)