Shinichi Sekizawa (関沢新一, Sekizawa Shin'ichi, June 2, 1921 – November 19, 1992) was a Japanese screenwriter noted for his immense contributions to several films by Ishirō Honda, including several classic Godzilla films. He also contributed material to the original Ultraman series and several Tōei Dōga films such as Gulliver's Travels Beyond the Moon and Jack and the Witch. His very first screenplay was for the independently produced film (though distributed by Shintoho Studios) Fearful Attack of the Flying Saucers, which was also his sole directing credit.