HaMaas (, HaMa'as, ) was a weekly publication of the Lehi, an armed Zionist militant group and self-described terrorist organization in Mandatory Palestine. Other publications by the Lehi included the daily Mivrak ('Telegram'), the monthly HaKhazit ('the Front'), and BaMahteret ('Underground').
The publication first came to public attention in July 1946 after the report of the Anglo-American Committee of Inquiry and a British Colonial Office White Paper identified an article in the second issue indicating that a Lehi attack on the Haifa Oil Refinery on the night of 31 October/1 November 1945 had been coordinated with other attacks on the same night by the Haganah (on railways), the Irgun (on Lydda railway station) and the Palmach (on two British coast guard vessels in Haifa harbour) under the overall direction of the Jewish Agency. Hamaas noted,
In addition to the Hamaas article the British government published intercepted telegrams between the Jewish Agency in Jerusalem and Zionist leaders in London that demonstrated Jewish Agency control over the formal organisation established by the Haganah, Irgun and Lehi to coordinate their actions, which was known as the Tenuat Hameri (United Resistance Movement).