Otto Lyng (15 July 1926 - 9 September 2003) was a Norwegian politician for the Conservative Party.
He was born in Enebakk.
He was elected to the Norwegian Parliament from Sør-Trøndelag in 1958, and was re-elected on four occasions. He had previously been a deputy representative from 1954 - 1957.
Lyng was a member of Trondheim city council in the terms 1959 - 1963 and 1995 - 1999, and of Sør-Trøndelag county council in 1979 - 1983.