Nils Daniel Tarschys (born 21 July 1943) is a Swedish academic and politician who is currently professor of political science at Stockholm University.

He was Secretary General of the Council of Europe from 20 June 1994 to 1 September 1999, when he was succeeded by Walter Schwimmer.

His tenure was remarkable for the accession of a number of countries, notably Russia, to the Council of Europe.

[2] In 1972 he completed his PhD thesis on "Beyond the State: The Future Polity in Classical and Soviet Marxism".

He was a member of the Riksdag for the Liberal People's Party in 1976 to 1982 and from 1985 to 1994, representing Stockholm County.