Eva-Maria ten Elsen (later Hartmann, born 14 September 1937) is a German former swimmer who won a bronze medal in the 200 m breaststroke event at the 1956 Summer Olympics.
She failed to qualify for the 1960 Olympics, and in 1961 retired from swimming. After graduating in 1966 from the German University of Physical Education (DHfK) in Leipzig she worked for several years as a swimming coach. From 1971 to 1990 she was employed by the sporting goods company Expovita. After the German Unification she worked in the real estate and public health insurance areas.