Usko Aatos Meriläinen (27 January 1930 – 12 November 2004) was a Finnish composer.
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.
[1] Meriläinen won an award for Jussi's film Private Area in 1963.