He was born in Israel as the youngest son of an immigrant family from Bender (Bessarabia). At the age of fifteen, he served in the Haganah and Palmach. In the Israeli War of Independence (1948) he fought on the southern front with the Negev Brigade, where he met his future wife, Hassida.
In 1953, Davidi volunteered for the new IDF paratroopers as a company commander. The next year, the unit was very active in retaliatory operations and other dangerous missions behind enemy lines. Davidi and his company supported Ariel Sharon’s Unit 101 in the raid on Qibya, he and Sharon remained close friends. He was decorated for actions in the Gaza strip in 1955 with the Medal of Courage.
In the Sinai Campaign, Davidi, as Lieutenant-Colonel and regimental commander, played a decisive role in the battle of Mitla Pass. From 1965 to 1968, as a colonel, he was the first commander of the IDF Paratrooper and Infantry Corps. During the 1967 Six Day War, Davidi commanded the decisive actions to capture Sharm-el-Sheik. When Raful Eitan was wounded in action, Davidi led his paratroopers to the Suez Canal.
Davidi began teaching geography at Tel Aviv University in 1974. Three years later, he moved to the Golan Heights as Director of Community and Cultural Activities of the Golan and Jordan Valley. In the summer of 1982, during the 1982 Lebanon War, Davidi founded the Sar-El IDF volunteer program. In 2010, Davidi won the Moskowitz Prize for Zionism.
Davidi, who lived in Ramat Gan, had three children, 11 grandchildren. and two great-grandchildren. His sister, Rivka Davidit, was a Hebrew children's author and theater critic.
Brig. Gen. (ret.) Dr. Aharon Davidi died on February 11, 2012.