Rüdiger Sagel (born 9 August 1955 in Lünen) is a German politician currently with the Left Party and previously with the Alliance '90/The Greens.

[1] On 30 June 2012 he and Gunhild Böth were elected in Münster as state spokespersons for the Left in North Rhine-Westphalia.

From 1968 to 1970, Sagel spent time at a German school in Rourkela, a city in the Indian state of Orissa, but by 1975, he had completed his Abitur in Lünen.

Also during this time, he founded the Hambach-Gruppe with friends and colleagues, which was an initiative against the social and ecological consequences of surface mining.

On 11 May 2010, during the inaugural meeting of the Left state parliamentary group, Sagel and Carolin Butterwegge were elected as Deputy Chairpersons.

In 2009, Sagel presented a historiographical study on the suppressed Nazi-past of certain CDU and FDP members of state parliament who served after 1945.

Sagel is also a member of the Vereinte Dienstleistungsgewerkschaft (a German trade organization), as well as the Charitable Society in Support of Asylum Seekers (GGUA).