The Egoz Unit (Hebrew: יחידת אגוז, romanized: Yehidat Egoz, lit. "Walnut Unit", Egoz being the acronym for "anti-guerrilla and small-scale warfare"), officially Unit 621, is an elite Israel Defense Forces (IDF) commando unit specializing in anti-guerrilla warfare, special reconnaissance, and direct action. It is a part of the IDF Central Command's 89th Brigade (commonly referred to as the commando brigade).

The unit specializes in combat in dense terrain, fieldcraft, camouflage, and guerrilla warfare—close-range fighting where the fighter's skill and professionalism are critical to success. The unit operates in all terrains and theaters, focusing mainly on the northern sector.

Egoz also has a unique ordnance platoon, tasked with developing creative solutions and technological innovations to address new challenges encountered on the battlefield and to provide defense against new methods of enemy attack.

The unit's memorial site, commemorating its various incarnations, is located at Nabi Hazuri in the northern Golan Heights.

In its first iteration, the unit was established in 1956 as Sayeret Egoz, a Northern Command reconnaissance unit, and operated until the end of the Yom Kippur War in 1974.

The current Egoz unit was formed in January 1995 from a team of Paratroopers Reconnaissance Unit soldiers, as part of the Golani Brigade. It was named after the original Sayeret Egoz unit that operated under Northern Command until 1974. The initiative to establish the unit was driven by then-Chief of Staff Amnon Lipkin-Shahak and Northern Command Commander Amiram Levin, who sought to revolutionize the fight against Hezbollah through new combat doctrines and tactics. The unit was attached to the Golani Brigade due to the claim by its commander, Moshe Kaplinsky, that the new unit required the support, mentorship, and logistics of an experienced unit, well-versed in combat in Lebanon.

Egoz was created as a guerrilla warfare unit specifically to fight Hezbollah in the Security Zone of southern Lebanon. Its first commander was Erez Zuckerman, a former member of Shayetet 13, who led the unit through most of its initial operations. Within six months of its establishment, the unit had already achieved notable successes, including its first operation, during which it killed two Hezbollah militants near the Hula outpost.

In 1997, Moshe (Chico) Tamir from the Golani Brigade took command of the unit. His tenure was marked by determined fighting against Hezbollah. One of the most notable operations during his command was Operation Wild Nature in September 1997, where the unit killed Hadi Nasrallah, the son of Hezbollah's Secretary-General Hassan Nasrallah. The bodies of the militants were later returned to Lebanon in exchange for the remains of Shayetet 13 commando Itamar Eliyahu, who had been killed in the Shayetet Disaster. Another significant operation during this time was Operation Brilliant Move, in which Tamir led the unit in a mission in Lebanon against a Hezbollah security squad in the village of Aindouriyah, killing eight militants.