Waldemar Włodzimierz Witkowski is a Polish politician who is currently leader of the Labour Union, and was formerly one of the leaders of the Left and Democrats coalition, of which the Labour Union was a part. Since 2006 he is a member of the Greater Poland Regional Assembly.

Left and Democrats was a centre-left electoral alliance of political parties in Poland which was created on 3 September 2006, before the Warsaw municipal election of 2006. The coalition's aim was to provide an alternative for both Law and Justice and Civic Platform, which have been Poland's two major political parties since 2005. LiD contested their first national election in October, 2007 and won 53 seats to the Polish parliament, the Sejm. The LiD alliance was dissolved in April 2008, following a rift between the member parties.