Konstantin Kosachev (Russian: ?????????? ???????; born 17 September 1962) is a Russian politician and diplomat.
He is senator at the Federation Council (Russian parliament's upper house) and chairs its Foreign Affairs Committee.
After graduating from the Moscow State Institute of International Relations, Kosachev was a diplomat at the Russian Embassy in Sweden.
He was elected to the State Duma in 1999.
He was appointed head of Rossotrudnichestvo in 2012.
In December 2014, he became a member of the Federation Council.