Deputy interior minister (1975–2012)
Later, King Khalid appointed him as the deputy minister of interior on 16 December 1975.
As deputy interior minister (also translated as vice minister), he served under Interior Minister Prince Nayef bin Abdulaziz Al Saud; at the time, Prince Muhammad bin Nayef was assistant interior minister. The interior ministry played a key role in Saudi Arabia's state security apparatus (with a total 2003 internal security budget of US$7 billion), with a counterterrorism mandate, especially after the Riyadh compound bombings of May 2003. A 2004 report by the Center for Strategic and International Studies noted that although corruption within the kingdom was common, "Prince Nayif and Prince Ahmad are reported to pay massive bonuses to successful security officers, but also have a reputation for honesty and using the massive security budget only for the mission and not to enrich themselves."
His main function as deputy interior minister was to deal with the different provinces of the Kingdom. Ahmed bin Abdulaziz was also operational head of special security force, which reports directly to the interior minister. This force was established in 1979 after the Saudi Arabian National Guard's poor response to the seizure of the Grand Mosque in Mecca.
In the early 1980s, in the wake of the riots in the Eastern Province in 1979, Prince Ahmed was tasked with introducing reforms to improve the province, where the kingdom's Shi'ite minority lives. Prince Ahmad acknowledged that the Saudi government had neglected the region and had discriminated against Shi'ites; he also promised massive investments in the development of Al Hasa's economic infrastructure, educational system, and other services. The other task of Prince Ahmed as deputy interior minister was to coordinate the contacts with ulema (the religious leaders). He also served as the vice president of the supreme commission for industrial security and chairman of preparatory committee for national security. In addition, he was the deputy chairman of civil defense council.
In 2006, Prince Ahmed called for construction of a fence along the Iraq–Saudi Arabia border, which he said was not a "segregation wall" but a border security measure.
Saudi journalist Jamal Khashoggi stated that Prince Ahmed was mostly involved in administrative matters instead of security during his tenure as deputy interior minister. Ahmed bin Abdulaziz visited Pakistan in November 2005 for three days and examined the extent of destruction caused by the Kashmir earthquake from an airplane. He promised to provide Pakistan whatever needed for the rebuilding process after the earthquake. He encouraged all Muslim nations to provide aid to Pakistan. He also condemned terrorism and stated it was incompatible with Islam.
Prince Ahmed said in a press conference in 2011 that for women, driving is against the law. After his appointment as interior minister, it was argued that, like Salman, he was also a supporter of King Abdullah's cautious reform initiatives.