Tetsuji Hayashi (Japanese: 林 哲司, Hepburn: Hayashi Tetsuji, born August 20, 1949) is a Japanese composer, singer-songwriter, and arranger known for his influential contributions to the development of J-pop and city pop during the 1980s. He was exposed to Western pop music from an early age, sparking his passion for music. He honed his skills as a composer and arranger, and in 1978, he composed Mariya Takeuchi's debut album, Beginning, followed by her hit single "September" in 1979 and "Mayonaka no Door" for Miki Matsubara that same year.