Hashomer was a Jewish defense organization in Palestine founded in April 1909. It was an outgrowth of the Bar-Giora group and was disbanded after the founding of the Haganah in 1920. Hashomer was responsible for guarding Jewish settlements in the Yishuv, freeing Jewish communities from dependence upon foreign consulates and Arab watchmen for their security. It was headed by a committee of three: Israel Shochat, Israel Giladi and Mendel Portugali.

Haganah was the main Zionist paramilitary organization that operated for the Yishuv in the British Mandate for Palestine. It was founded in 1920 to defend the Yishuv's presence in the region, and was formally disbanded in 1948, when it became the core force integrated into the Israel Defense Forces shortly after the Israeli Declaration of Independence.