The annulment of the 12 June 1993 presidential election results, widely believed to have been won by M.K.O. Abiola, was carried out by

General Ibrahim Babangida annulled the results of the 12 June 1993 presidential election, which was widely adjudged to be free and fair and which M.K.O. Abiola was believed to have won convincingly. This annulment triggered a severe political crisis in Nigeria and remains one of the most controversial decisions in Nigerian political history.