Shlomo Ben-Yosef (Hebrew: שלמה בן-יוסף; May 7, 1913 – June 29, 1938) was a member of the Revisionist Zionist underground group Irgun. He is most noted for his participation in an April 21, 1938 attack on a bus carrying Arab civilians, intended as a retaliation for an earlier attack by Arabs against Jews, and emblematic as a rejection of the establishment policy of Havlagah, or restraint. For this reason, and especially for having been the first Jew executed by the British authorities during the mandate period, Ben-Yosef is revered in the highest terms by right-wing Zionist groups such as Betar, Irgun, Jewish Defense League and the Kach movement (an organisation outlawed in Israel), and is memorialized by those groups as one of 12 Olei Hagardom.
Shlomo Ben-Yosef was born Shalom Tabachnik in Poland to a religious Jewish family. He joined the Revisionist Zionist youth movement Betar in 1928, and two years later, he became the family breadwinner after the death of his father.
In 1937, he decided to emigrate to Mandatory Palestine. After his application for an immigration certificate was rejected, he illegally immigrated to Palestine, arriving on September 20, 1937. There, he joined the Betar labor company at Rosh Pinna - upon arrival there, he burned his Polish passport and changed his name to Shlomo Ben-Yosef. Shortly after arriving at Rosh Pinna, he was accepted into the Irgun. He found a job at the port of Haifa.
On March 28, 1938, a car containing 10 Jews was ambushed by Arabs on the Acre-Safad road and six of them were killed. In revenge, Shlomo Ben-Yosef (24), Avraham Shein (17) and Yehoshua "Shalom" Zurabin (19), all of whom were Betar members from Rosh Pina, began planning a revenge attack.