Babatunde "Tunde" Idiagbon (14 September 1942 – 24 March 1999) was a Nigerian army officer and a one-time member of the Nigerian military juntas of 1966–1979 and 1983-1998 Nigerian military junta which ruled that country. He served as a military administrator of Borno State in the 1970s in the military administration of Olusegun Obasanjo. Following the ouster of the civilian administration of Shehu Shagari at the end of 1983, he rose to become the Chief of Staff, Supreme Headquarters and defacto Vice President in the military administration of Muhammadu Buhari.
In this role, he was the de-facto second-in-command and was responsible for implementing many of the government's policies. Chief amongst these was the War Against Indiscipline (WAI), which was a campaign to eradicate corruption and disorderliness in Nigerian life.
After 20 months in power, the government of Buhari was overthrown by Ibrahim Babangida. Idiagbon was removed from his position in this coup, and he was placed under house arrest for 3 years. After his release, he returned to civilian life in his hometown of Ilorin, Nigeria, where he died in 1999 of an unknown illness after returning from a conference. Rumors have circulated about Idiagon dying from poisoning, however these rumors remain unsubstantiated.