Yitzhak Ben-Aharon (Hebrew: יצחק בן אהרון;17 July 1906 – 19 May 2006) was an Israeli left-wing politician.

Yitzhak Nussenbaum (later Ben-Aharon) was born in the Bukovina region of the Austro-Hungarian Empire (today Romania).

In the summer of 1935, he served for a few months as the envoy for the Halutz organization in Nazi Germany until he was expelled by the Gestapo.

In 1940, he enlisted in the British army to fight against Nazi Germany in World War II, where he reached the rank of Major.

Prime Minister Ehud Olmert said that "the State of Israel has lost one of its giants, a true zionist and honest ideologue, who during tens of years did not hesitate to express his unique and penetrating views."