Marek Kotański (March 11, 1942 – August 19, 2002) was a Polish charity worker and campaigner on behalf of disadvantaged people, including the homeless and those with HIV.
He cooperated with the Społeczny Komitet Przeciwdziałania Alkoholizmowi (Social Anti-Alcoholism Committee), and also was active in the Ruch Trzeźwość (Abstinence Movement).
The first Monar centre was opened on 15 October 1978 in Gloskow near Garwolin, starting in part of an abandoned house in ruins.
He also organised settlements for people with HIV or ill with AIDS, starting another association Solidarni Plus (Solidarity Plus).
From 1985 to 1994 Kotański organised the action "Łańcuch Czystych Serc" (Chain of Pure Hearts), where hundreds of thousands of young people joined hands in a chain stretching from the Baltic Sea to the Tatra mountains, symbolising unity for humanitarianism.