A military coup in Sierra Leone replaces President Ahmad Tejan Kabbah with Major Johnny Paul Koroma.

A coup d'état, or simply a coup, is typically an illegal and overt attempt by a military organization or other government elites to unseat an incumbent leadership. A self-coup is said to take place when a leader, having come to power through legal means, tries to stay in power through illegal means.

Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It is bordered to the southeast by Liberia and by Guinea to the north. Sierra Leone's land area is 73,252 km² (28,283 sq mi). It has a tropical climate and environments ranging from savannas to rainforests. As of the 2023 census, Sierra Leone has a population of 8,460,512. Freetown is its capital and largest city.

Alhaji Ahmad Tejan Kabbah was a Sierra Leonean politician who served twice as the 3rd President of Sierra Leone, from 1996 to 1997 and again from 1998 to 2007. An economist and attorney by profession, Kabbah spent many years working for the United Nations Development Programme. He retired from the United Nations and returned to Sierra Leone in 1992.

Major Johnny Paul Koroma was a Sierra Leonean military officer who was the head of state of Sierra Leone from May 1997 to February 1998.