thumb|right|upright|Emblem of the brigade
The 11th Brigade (also known as the Yiftach Brigade) is a reserve formation of the Israel Defense Forces, composed mainly of fighters that completed their compulsory service in the Unit 621 – 'Egoz'. The brigade is assigned to the 99th Infantry Division.
History
In the 1948 Arab–Israeli War it was a Palmach infantry brigade. It was formed in late April 1948 from existing Palmach battalions: the First Battalion, that resided in Jezreel Valley and the Third Battalion in the eastern valleys. In late 1948, the Second Palmach Battalion was transferred to it from the Negev Brigade.
The Palmach memorial website records 274 of its members being killed whilst in the Yiftach Brigade.
In May 1949 the Palmach brigade was disbanded. This was part of a general downsizing of the IDF (9 out of 12 brigades were disbanded). It was also considered by many as part of Ben-Gurion's process of disbanding the Palmach itself.
A while after that, it was re-established as a reserve unit that served in the Gaza Strip front As an infantry brigade it also fought in the Suez Crisis and in the Six-Day War in the Gaza Strip