First Civil War may refer to:

• First Central American Civil War (1826–1829)
• First Civil War (Kazakh Khanate) (1522–1538)
• First Congo War (1996–1997), also referred to as a civil war
• First English Civil War (1642–1646)
• First Honduran Civil War (1919)
• First Ivorian Civil War (2002–2007)
• First Liberian Civil War (1989–1996)
• First Libyan Civil War (2011)
• First Republic of the Congo Civil War (1993–1994)
• First Sudanese Civil War (1955–1972)
• First War of Religion (1562-1563) in the French Civil Wars of Religion

• Civil War (disambiguation)
• Second Civil War (disambiguation)