Ruler's Representative in Al Ain Region since August 1971, United Arab Emirates.

He held several positions, including: Minister of Municipalities and Agriculture, Chairman of the Municipality and Agriculture Department in Al Ain, member of the Board of Directors of the Abu Dhabi Fund for Development and the Abu Dhabi Investment Authority, Chairman of the Abu Dhabi National Oil Company ADNOC, and Vice Chairman of the Council. Executive Director of the Emirate of Abu Dhabi , and member of the Supreme Petroleum Council.

In November 2018, the road from Al Ain to Dubai was named in his honour.

Sheikh Tahnoun bin Mohammed’s professional career

He accompanied the late Sheikh Zayed bin Sultan Al Nahyan, the founder of the UAE, and Sheikh Zayed placed his trust in them and appointed him in 1966 to his first official position, a month after Sheikh Zayed took the reins of government in the Emirate of Abu Dhabi. At that time, Sheikh Tahnoun assumed the position of Chairman of the Department of Agriculture and Mayor of Al Ain. During his career, he held the following positions:

• Chairman of the Department of Agriculture and Mayor of Al Ain in September 1966
• Minister of Municipalities and Agriculture in July 1971
• Representative of the ruler in the Al Ain region in August 1971
• Member of the Board of Directors of the Abu Dhabi Fund for Arab Economic and Development in July 1972
• Minister of Municipalities and Agriculture, Chairman of the Board of Directors of Abu Dhabi National Oil Company in July 1973
• Chairman of the Department of Municipalities and Agriculture in Al Ain in January 1974
• Member of the Board of Directors of the Abu Dhabi Investment Authority in March 1976
• Vice Chairman of the Executive Council and Head of the Municipality and Agriculture Department in Al Ain in January 1977
• Member of the Supreme Petroleum Council in June 1988

He was famous for his proximity and direct communication with the people of the Al Ain region.

Some members of the family of Sheikh Tahnoun bin Mohammed Al Nahyan

• Sheikha Shamma bint Zayed Al Nahyan (wife), is the daughter of the late Sheikh Zayed bin Sultan Al Nahyan, founder of the United Arab Emirates.
• Sheikha Salama bint Hamdan Al Nahyan (niece), is the wife of UAE President Sheikh Mohammed bin Zayed, founder of the Salama bint Hamdan Foundation.
• Sheikh Suroor bin Mohammed Al Nahyan (brother).
• Sheikha Hessa bint Mohammed Al Nahyan (late sister), is the wife of the late Sheikh Zayed bin Sultan Al Nahyan, and mother of the late President Sheikh Khalifa bin Zayed Al Nahyan.
• Sheikh Sultan bin Tahnoun Al Nahyan (son), is a member of the Executive Council of the Emirate of Abu Dhabi.
• Sheikh Khalifa bin Tahnoun Al Nahyan (son), is the head of the Court of the Crown Prince of Abu Dhabi.
• Sheikh Ahmed bin Tahnoun Al Nahyan (son), Deputy Chief of Staff of the Armed Forces of the United Arab Emirates.
• Sheikh Dhiyab bin Tahnoun Al Nahyan (son).

His death

On May 1, 2024, Sheikh Mohammed bin Zayed Al Nahyan, President of the United Arab Emirates, mourned Sheikh Tahnoun bin Mohammed Al Nahyan, in a statement from the Presidential Court: “In the name of Allah, the most gracious, the most merciful … With hearts faithful to God's decree and destiny, President His Highness Sheikh Mohamed bin Zayed Al Nahyan mourns his uncle, Sheikh Tahnoon bin Mohammed Al Nahyan, Abu Dhabi Ruler’s Representative in Al Ain Region, who passed away today". The Presidential Court declared official mourning with flags flown at half-mast for a period of seven days starting from May 1.