Mordechai Alkahi (Hebrew: מרדכי אלקחי; March 10, 1925 – April 16, 1947) was a member of the Irgun Jewish guerrilla organization in pre-state Mandatory Palestine, and one of 12 Olei Hagardom.

Alkahi went on to participate in sabotage operations against the telephone network and railways, and arms raids on British camps in Netanya, Tel Aviv, and Rosh HaAyin.

On April 23, 1946, he participated in an arms raid on the Ramat Gan police station, in which a large quantity of weapons and munitions were stolen.

Alkahi was part of a team consisting of Eliezer Kashani, Yehiel Dresner, Avraham Mizrahi, and Haim Golevsky.

After Alkahi and the three surviving members of his team were captured, they were held in a British paratroopers' camp, during which they were repeatedly subjected to severe beatings and humiliations.

[1] The action shocked the Yishuv (Jewish community in Palestine), and the municipality of Petah Tivka, from where Alkahi and two others were from, organized a petition on their behalf signed by 800 residents.

The British authorities decided not to permit the men to have a traditional Jewish burial, or to grant their final request that they be buried in Rosh Pinna, near the grave of Shlomo Ben-Yosef.

Neither the chevra kadisha nor the families were informed, and the British would guard the graves for months afterward to prevent the Irgun from secretly exhuming the bodies and fulfilling their wishes to be buried in Rosh Pinna.

Today, Alkahi is considered a national hero in Israel, and streets are named for him in Tel Aviv, Jerusalem, and Beersheba.