Seppo Antero Nummi (30 May 1932 Oulu – 1 August 1981, Tampere) was a Finnish critic, composer and cultural administrator. He was one of the founders of the Jyväskylä Summer Festival, and was its artistic director, and he also was the executive director of the Helsinki Festival. As a composer, Nummi was most interested in solo Song. The texts of his songs are mainly based on Finnish and ancient Chinese poetry. Most of the Sydänmaa (Wilderness) -songs are composed when Nummi was 16 years old.