Khalid bin Abdulaziz Al Saud (Arabic: خالد بن عبد العزيز آل سعود‎‎ Khālid ibn ‘Abd al ‘Azīz Āl Su‘ūd; 13 February 1913 – 13 June 1982) was King of Saudi Arabia from 1975 to 1982. His reign saw both huge developments in the country due to increase in oil revenues and significant events in the Middle East.

Khalid was born in Riyadh on 13 February 1913. He was the fifth son of King Abdulaziz. His mother, Al Jawhara bint Musaed Al Jiluwi, was from the important Al Jiluwi clan whose members intermarried with Al Sauds.

Khalid had one full-brother, Prince Muhammad. His full sister, Al Anoud, married to the sons of Sa'ad bin Abdul Rahman. She first married Saud bin Saad. After Saud died, she married Fahd bin Saad.

Aged 14, Khalid bin Abdulaziz was sent by King Abdulaziz as his representative to the desert tribes to hear their concerns and problems. In 1932, Prince Khalid was named as viceroy of the Hejaz, replacing Prince Faisal in the post, who was named minister of foreign affairs. Prince Khalid's term as viceroy of Hejaz lasted until 1934. Prince Khalid joined the Saudi army led by his older brother Prince Faisal and fought against Yemeni forces in 1934. After the war, Prince Khalid served as the chairman of the Saudi delegation at the Taif Conference with Yemen in 1934. This was a diplomatic move that led to the Taif Treaty later that year.

Then he was named interior minister in 1934 and was the Saudi representative at the peace negotiations. In 1939, he participated in the St. James Conference on Palestine in London as an assistant to Prince Faisal, head of the Saudi delegation. Prince Khalid's preparation for ruling a modern state started through his visits with Prince Faisal on foreign missions, representing Saudi Arabia at the United Nations. Prince Khalid served as advisor of him. Prince Khalid became an international figure as a result of his visits and service as Saudi representative. He was more liberal in informing the press about the rationale behind foreign policy decisions.

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