Pachachi was born in Baghdad into the Abdah branch of the Shammar tribe.
As the son of Muzahim al-Pachachi, nephew of Hamdi al-Pachachi and the cousin of Nadim al-Pachachi, he was the scion of a Sunni Arab nationalist family with a long tradition in Iraqi politics and a graduate from Victoria College, Alexandria in Egypt.
He supported the 1941 Iraqi coup d'état led by Rashid Ali Al-Gaylani as a member of the Kata'ib al-Shabab (Youth Brigade).

Pachachi completed his undergraduate studies in 1943 at the American University of Beirut in Lebanon, majoring in political science.
While attending the university, he was inspired by the early emergence of the Arab Nationalist Movement on the campus.
After his return to Iraq, his application for a job in the Ministry of Foreign Affairs was refused by the Iraqi Criminal Investigation Department due to his participation in the Kata'ib al-Shabab and support for the 1941 coup.

Eventually, in 1950, he was appointed assistant director of the Political Department in the Iraqi Ministry of Foreign Affairs and continued to work in the Foreign Service over the next eight years.
In 1958, the union of Egypt and Syria was led by Gamal Abdel Nasser and the United Arab Republic was founded.
 Pachachi had been a vocal supporter of Nasser, particularly during the Suez War in 1956 although official Iraqi government policy at the time was aligned with the British against him.
On his attraction to the Egyptian leader he wrote in his memoir "My feelings about Egypt and Jamal Abdul Nasser had deep-rooted origins.
In the first place I shared my father's belief that Egypt was the most important Arab country and that Iraq should at all times should have the best relations with her.
My father, in and out of power, consistently called for the closest ties with Egypt.
It cost him his political career in 1950.
He remained very close to Abdul Nasser and supported him during the fateful days of the Suez War.
Being a fervent Arab nationalist, I was naturally attracted by Nasser's call for Arab unity, and during the Suez crisis I supported him without reservation.
I admired Abdul Nasser because he personified more than anyone, the idea or Arab unity and seemed the only leader capable of achieving it."
It was for this reason he was not trusted by Prime Minister Nuri as-Said and deemed to be a Nasserist.
On 13 July 1958 he was dismissed and removed from the Iraqi Foreign Service due to his pro-Nasserite positions.

The very next day was the 14 July Revolution led by Abdul Karim Qassim.
The Hashemite monarchy and Nuri as-Said were overthrown.
Pachachi was promptly appointed Iraq's Permanent Representative to the United Nations in 1959 by Qassim's revolutionary regime.
During this time Iraq formed a close relationship with the Soviet Union led by Nikita Khrushchev.
Under Qassim, Iraq was a founding member of the Non-Aligned Movement in 1961 and Pachachi met with founding leaders Josep Broz Tito, Kwame Nkrumah, Jawaharlal Nehru, Fidel Castro, and Sukarno as a representative of his country.
During his time at the United Nations he also met with well-known figures such as Patrice Lumumba and Malcolm X. The Qassim regime recognised the People's Republic of China and Pachachi argued very strongly for their inclusion at the United Nations.
Despite the brutal 1963 coup which removed Qassim from power in Iraq, Pachachi remained the representative at the United Nations.

Pachachi wrote extensively about his time at the UN in his memoir, Iraq's Voice at the United Nations: 1959-1969.
He expressed his dismay at the influence of the Zionist lobby over western media and speculated on the reasons for the support displayed for Israel. "
The press of many Western countries abound with news commentaries and photographs extolling Israel's achievements and exploits, and scarcely hiding the perverse and malicious pleasure felt at the new tragedy that has befallen the people of Palestine.
What can the meaning of all this be?
Perhaps, in due course, some introspective and compassionate minds in the West might invest some time in soul-searching
Pachachi was born in Baghdad into the Abdah branch of the Shammar tribe. As the son of Muzahim al-Pachachi, nephew of Hamdi al-Pachachi and the cousin of Nadim al-Pachachi, he was the scion of a Sunni Arab nationalist family with a long tradition in Iraqi politics and a graduate from Victoria College, Alexandria in Egypt. He supported the 1941 Iraqi coup d'état led by Rashid Ali Al-Gaylani as a member of the Kata'ib al-Shabab (Youth Brigade).
Pachachi completed his undergraduate studies in 1943 at the American University of Beirut in Lebanon, majoring in political science. While attending the university, he was inspired by the early emergence of the Arab Nationalist Movement on the campus. After his return to Iraq, his application for a job in the Ministry of Foreign Affairs was refused by the Iraqi Criminal Investigation Department due to his participation in the Kata'ib al-Shabab and support for the 1941 coup.
Eventually, in 1950, he was appointed assistant director of the Political Department in the Iraqi Ministry of Foreign Affairs and continued to work in the Foreign Service over the next eight years. In 1958, the union of Egypt and Syria was led by Gamal Abdel Nasser and the United Arab Republic was founded.  Pachachi had been a vocal supporter of Nasser, particularly during the Suez War in 1956 although official Iraqi government policy at the time was aligned with the British against him. On his attraction to the Egyptian leader he wrote in his memoir "My feelings about Egypt and Jamal Abdul Nasser had deep-rooted origins. In the first place I shared my father's belief that Egypt was the most important Arab country and that Iraq should at all times should have the best relations with her. My father, in and out of power, consistently called for the closest ties with Egypt. It cost him his political career in 1950. He remained very close to Abdul Nasser and supported him during the fateful days of the Suez War. Being a fervent Arab nationalist, I was naturally attracted by Nasser's call for Arab unity, and during the Suez crisis I supported him without reservation. I admired Abdul Nasser because he personified more than anyone, the idea or Arab unity and seemed the only leader capable of achieving it." It was for this reason he was not trusted by Prime Minister Nuri as-Said and deemed to be a Nasserist. On 13 July 1958 he was dismissed and removed from the Iraqi Foreign Service due to his pro-Nasserite positions.
The very next day was the 14 July Revolution led by Abdul Karim Qassim. The Hashemite monarchy and Nuri as-Said were overthrown. Pachachi was promptly appointed Iraq's Permanent Representative to the United Nations in 1959 by Qassim's revolutionary regime. During this time Iraq formed a close relationship with the Soviet Union led by Nikita Khrushchev. Under Qassim, Iraq was a founding member of the Non-Aligned Movement in 1961 and Pachachi met with founding leaders Josep Broz Tito, Kwame Nkrumah, Jawaharlal Nehru, Fidel Castro, and Sukarno as a representative of his country. During his time at the United Nations he also met with well-known figures such as Patrice Lumumba and Malcolm X. The Qassim regime recognised the People's Republic of China and Pachachi argued very strongly for their inclusion at the United Nations. Despite the brutal 1963 coup which removed Qassim from power in Iraq, Pachachi remained the representative at the United Nations.
Pachachi wrote extensively about his time at the UN in his memoir, Iraq's Voice at the United Nations: 1959-1969. He expressed his dismay at the influence of the Zionist lobby over western media and speculated on the reasons for the support displayed for Israel. "The press of many Western countries abound with news commentaries and photographs extolling Israel's achievements and exploits, and scarcely hiding the perverse and malicious pleasure felt at the new tragedy that has befallen the people of Palestine. What can the meaning of all this be? Perhaps, in due course, some introspective and compassionate minds in the West might invest some time in soul-searching
Adnan Pachachi