Jan Krzysztof Kelus, also known by his initials JKK, (born 1942) is a Polish singer, poet, composer, and a member of the democratic opposition in Poland between the 1960s and 1980s.
A professional sociologist, Kelus is best known for a number of ballads which gained him a nickname of the Bard of the opposition and Polish Woody Guthrie.
After the events of March 1968 he became involved in various groups of the democratic opposition to the Communist regime of the People's Republic of Poland.
Arrested in 1981 after the imposition of the Martial Law in Poland, Kelus was interned in Białołęka, along with other notable leaders of the Solidarity.
After the peaceful transition of power in Poland in 1989, Kelus withdrew from public life to a house near Białowieża, where he owns a small beekeeping farm.