| Country | National holiday |
| Saint Barthelemy | Bastille Day, 14 July (1789); note - local holiday is St. Barthelemy Day, 24 August |
| Saint Helena | Birthday of Queen ELIZABETH II, second Saturday in June (1926) |
| Saint Kitts and Nevis | Independence Day, 19 September (1983) |
| Saint Lucia | Independence Day, 22 February (1979) |
| Saint Martin | Bastille Day, 14 July (1789); note - local holiday is Schoalcher Day (Slavery Abolition Day) 12 July (1848) |
| Saint Pierre and Miquelon | Bastille Day, 14 July (1789) |
| Saint Vincent and the Grenadines | Independence Day, 27 October (1979) |
| Samoa | Independence Day Celebration, 1 June (1962); note - 1 January 1962 is the date of independence from the New Zealand-administered UN trusteeship; it is observed in June |
| San Marino | Founding of the Republic, 3 September (A.D. 301) |
| 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 | National Day, 15 February |
| Seychelles | Constitution Day (National Day), 18 June (1993) |
| Sierra Leone | Independence Day, 27 April (1961) |
| Singapore | National Day, 9 August (1965) |
| Sint Maarten | Queen's Day (Birthday of Queen-Mother JULIANA and accession to the throne of her oldest daughter BEATRIX), 30 April (1909 and 1980) |
| Slovakia | Constitution Day, 1 September (1992) |
| Slovenia | Independence Day/Statehood Day, 25 June (1991) |
| Solomon Islands | Independence Day, 7 July (1978) |
| Somalia | Foundation of the Somali Republic, 1 July (1960); note - 26 June (1960) in Somaliland |
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