Abdullahi Adamu (born 23 July 1946) is a Nigerian politician who was the governor of Nasarawa State in Nigeria from 29 May 1999 to 29 May 2007. He is a member and former national chairman of the ruling Party All Progressives Congress (APC). Abdullahi Adamu was born at Keffi, Nasarawa State, on 23 July 1946.

He attended the Government Secondary School, Makurdi (1960–1962), the Government Technical College, Bukuru (1962–1965), and Kaduna Polytechnic (1965–1968). He returned to Kaduna Polytechnic for a Higher National Diploma in June 1971.

Adamu started work in 1967 with the Electricity Corporation of Nigeria. In 1971, he joined the Northern Nigeria Development Corporation (NNDC) Kaduna. In 1973, he joined AEK, a consultancy firm, where he was Project Manager for construction of Durbar Hotel and Murtala Mohammed Square, Kaduna.

In October 1975, he was appointed the Executive Secretary of the Benue/Plateau Construction Company by the Benue/Plateau State government. From February 1980 – September 1983, he was Chairman of the Benue Cement Company, Gboko.

In 1987, he enrolled in the part-time degree programme of the University of Jos, obtaining an LLB (Hons) in 1992. He enrolled in the Nigerian Law School, Lagos where he obtained his BL and was called to the Bar as a solicitor and Advocate of the Supreme Court of Nigeria in December 1993.

Adamu entered politics in 1977, and was elected to the Constituent Assembly, which drafted the constitution for Nigeria's short-lived Second Republic (1979–1983). He was a pioneer member of the National Party of Nigeria (NPN), the first Secretary-General of the NPN in Plateau State from December 1978, and chairman of the NPN in Plateau from 1982 to 1983.

In 1994, he was appointed to the National Constitutional Conference by General Sani Abacha's administration. In March 1995, Adamu was appointed Minister of State for Works and Housing, holding this position until November 1997.

When the ban on political activity was lifted in 1997, he joined the United Nigeria Congress Party (UNCP). In 1998, Adamu became a founding member of the People's Democratic Party (PDP). During the 1999 Nasarawa State gubernatorial election, Abdullahi Adamu ran successfully for the position of governor on the PDP platform.

He was re-elected during the 2003 Nasarawa State gubernatorial election. In December 2003, Adamu welcomed Elizabeth II of the United Kingdom on a visit to Karu, where she was entertained by cultural troupes. He promised to make Nasarawa famous with its solid mineral resources and tourist attractions like the Farin Ruwa Wamba Waterfalls and Eggon hills.

Adamu backed the construction of the Farin Ruwa Falls Hydro-Electric plant, visiting South Korea in 2004 and awarding the engineering contract to the South Korean firm Yooshing Engineering. In September 2005, he launched the School Feeding Programme in Nasarawa.

After ending his two-term governorship, Adamu became Secretary, Board of Trustees (BOT) of the Peoples Democratic Party (PDP). In November 2009, a group of prominent PDP members supported his candidacy for the Nasarawa West Senate constituency in the 2011 elections.

In February 2010, Adamu was arrested by the Economic and Financial Crimes Commission (EFCC) for allegedly embezzling $100 million of government funds. Despite this, he was the PDP candidate for the Nasarawa West Senatorial seat in the April 2011 elections, winning with 121,414 votes.

In March 2022, Abdullahi Adamu was appointed national chairman by consensus of the All Progressives Congress (APC). In July 2023, he resigned as APC National Chairman.