Pre-code may refer to:

• Pre-Hays code Hollywood film industry, see Pre-Code Hollywood
• Pre-Comics Code Authority, see also Golden Age of comics
• Zero-forcing precoding
• Precoding in MIMO data transmission
• linearly precoded OFDM scheme, see Single-carrier FDMA

Pre-Code Hollywood refers to the brief era in the American film industry between the introduction of sound pictures in 1929 and the enforcement of the Motion Picture Production Code censorship guidelines in 1934, usually labeled, albeit inaccurately, as the "Hays Code". Although the Code was adopted in 1930, oversight was poor and it did not become rigorously enforced until July 1, 1934, with the establishment of the PCA. Before that date, movie content was restricted more by local laws, negotiations between the Studio Relations Committee (SRC) and the major studios, and popular opinion, than strict adherence to the Hays Code, which was often ignored by Hollywood filmmakers.