Lars Tangvik (23 May 1902 - 28 July 1991) was a Norwegian politician for the Liberal Party.
He was born in Stadsbygd.
He was elected to the Norwegian Parliament from Sør-Trøndelag in 1965, but was not re-elected in 1969. He had previously served in the position of deputy representative during the terms 1954 - 1957 (for Nord-Trøndelag) and 1958 - 1961.
Tangvik was a member of the municipality councils in Hegra, Stjørdal and Trondheim between 1945 and 1965.