Ewald Oskar Ludwig Loeser (11 April 1888 – 23 December 1970) was a German lawyer, a board member of Krupp AG and a member of the resistance to Nazism.
He was born in Storkow, Brandenburg and gained a doctorate in Administrative Law from The University of Göttingen in 1911. From 1930 to 1934 he served under Karl Goerdeler as the deputy mayor and treasurer of the city of Leipzig.
He joined board of the Friedrich Krupp AG in 1934 as Director of Administration and Finance. From 1939 he was also on the board of Dresdner Bank. In 1943 Karl Goerdeler convinced him of the necessity of a coup to overthrow Hitler. If the July 20 Plot assassination attempt had succeeded he was earmarked to be the Minister of Finance. He was arrested in its aftermath and on 20 October 1944 was tried by the People's Court, but he succeeded in convincing Roland Freisler that he was suffering from memory loss. Avoiding conviction he was committed to a sanatorium and survived the war.
In 1947 he was indicted at the Krupp Trial. Following his conviction in 1948 he was imprisoned for seven years. He died in 1970 aged 82.