Abubakar Dangiwa Umar (born 21 September 1949) was governor of Kaduna state in Nigeria from August 1985 to June 1988 during the military regime of General Ibrahim Babangida.

His father, Umaru Nassarawa, was a school teacher and administrator with the traditional title of Waziri of Gwandu who became a member of the House of Representatives in Lagos (1954 - 1964) and Commissioner for Works in the North-Western State (1968 - 1975).

He held various positions, including ADC to Major General Hassan Usman Katsina, Deputy Chief of Staff, Supreme Headquarters.

At the time of the coup of 27 August 1985 in which General Ibrahim Babangida assumed power he was a Major and Chairman of the Federal Housing Authority (1984 - 1985).

[8] After retirement, Umar became chairman and chief executive, Work and Worship (Gas Company) Nigeria Limited, Kaduna.

[10] In March 2004, he wrote a letter to President Olusegun Obasanjo in which he accused him of being an accomplice in the annulment of the 12 June 1993 Presidential election.

[12] In May 2005, he spoke out against the forced retirement of a deputy governor of the Central Bank of Nigeria and accused the government of insincerity in its fight against corruption.