Second civil war, Second Civil War, or Civil War II may refer to the fictional scenario of a Second American Civil War or the following topics.

• Second Central American Civil War (1838–1840)
• Second Congo War (1998–2003), also referred to as a civil war
• Second English Civil War (1648–1649)
• Second Honduran Civil War (1924)
• Second Ivorian Civil War (2010–2011)
• Second Liberian Civil War (1999–2003)
• Second Libyan Civil War (2014–2020)
• Second Republic of the Congo Civil War (1997–1999)
• Second Sudanese Civil War (1983–2005)

• The Second Civil War, 1997 made-for-television film
• Civil War II, a Marvel Comics comic book crossover storyline
• A second civil war in the United States akin to the American Civil War, which has been covered in speculative fiction.

• First Civil War (disambiguation)
• Civil War (disambiguation)