Fourth Republic may refer to:

• Fourth Republic of Uganda, since 1986
• Fourth Republic of Ghana, since 1993
• Fourth Republic of Niger, 1996–1999
• Fourth Nigerian Republic, since 1999
• Fourth Republic of Madagascar, since 2010

• Fourth Republic of Venezuela, 1953–1999
• Fourth Brazilian Republic, 1946–1964
• Fourth Dominican Republic, since 1965

• Fourth Philippine Republic, 1972–1986
• Fourth Republic of Korea, 1972–1981
• Fourth Cambodian Republic, 1989–1992

• French Fourth Republic (1946–1958)
• Fourth Czechoslovak Republic (1948–1990)

• 4th Republic, a 2019 Nigerian political drama film
• Fourth Polish Republic, a campaign slogan used by Law and Justice in the 2005 parliamentary elections
• 4K! – Fourth Republic!, a former left-wing Hungarian political part that existed from 2012 to 2016

• All pages with titles containing Fourth Republic
• First Republic
• Second Republic
• Third Republic
• Fifth Republic
• Sixth Republic
• Seventh Republic