Usko Aatos Meriläinen (January 27, 1930 – November 12, 2004) was a Finnish composer. He was born in Tampere. Usko Meriläinen studied orchestral conducting with Leo Funtek and composition with Aarre Merikanto at the Sibelius Academy. Meriläinen conducted the Finnish Opera Choir from 1954 to1956, the Kuopio City Orchestra from 1956 to 1957, and the Tampere Workers' Theater Orchestra from 1957 to 1961. He was chairman of the Finnish Composers' Association from 1981 to 1992 and served as artistic advisor of the Tampere Biennale. He is buried in the Hietaniemi Cemetery in Helsinki.