Sao Tome and Principe
Independence Day, 12 July (1975)
Saudi Arabia
Unification of the Kingdom, 23 September (1932)
Senegal
Independence Day, 4 April (1960)
Serbia and Montenegro
National Day, 27 April
Seychelles
Constitution Day (National Day), 18 June (1993)
Sierra Leone
Independence Day, 27 April (1961)
Singapore
Independence Day, 9 August (1965)
Slovakia
Constitution Day, 1 September (1992)
Slovenia
Independence Day/Statehood Day, 25 June (1991)
Solomon Islands
Independence Day, 7 July (1978)