The Armed Forces of Liberia (AFL) are the armed forces of the Republic of Liberia. Tracing its origins to a militia that was formed by the first black colonists in what is now Liberia, it was founded as the Liberian Frontier Force in 1908, and retitled in 1956. For almost all of its history, the AFL has received considerable materiel and training assistance from the United States. For most of the 1941–89 period, training was largely provided by U.S. advisers, though this assistance has not prevented the same generally low levels of effectiveness common to most of the armed forces in the developing world.

The First Liberian Civil War was the first of two civil wars within the West African nation of Liberia. It lasted from 1989 to 1997. President Samuel Doe established a regime in 1980 but totalitarianism and corruption led to unpopularity and the withdrawal of the support of the United States by the late 1980s. The National Patriotic Front of Liberia (NPFL) led by Charles Taylor invaded Liberia from the Ivory Coast to overthrow Doe in December 1989 and gained control over most of the country within a year. Doe was captured and executed by the Independent National Patriotic Front of Liberia (INPFL), a splinter faction of the NPFL led by Prince Johnson, in September 1990. The NPFL and INPFL fought each other for control of the capital city, Monrovia and against the Armed Forces of Liberia and pro-Doe United Liberation Movement of Liberia for Democracy. Peace negotiations and foreign involvement led to a ceasefire in 1995 but fighting continued until a peace agreement between the main factions occurred in August 1996. Taylor was elected President of Liberia following the 1997 Liberian general election and entered office in August of the same year.