word | | Currency (code) |
| States | Niger | Communaute Financiere Africaine franc (XOF); note - responsible authority is the Central Bank of the West African States (BCEAO) |
| States | Senegal | Communaute Financiere Africaine franc (XOF); note - responsible authority is the Central Bank of the West African States |
| States | Togo | Communaute Financiere Africaine franc (XOF); note - responsible authority is the Central Bank of the West African States |
| STD | Sao Tome and Principe | dobra (STD) |
| Sudanese | Sudan | Sudanese dinar (SDD) |
| Surinam | Suriname | Surinam dollar (SRD) |
| Swedish | European Union | euro, British pound, Bulgarian lev, Czech koruna, Danish krone, Estonian kroon, Hungarian forint, Latvian lat, Lithuanian litas, Polish zloty, Romanian leu, Slovak koruna, Swedish krona |
| Swedish | Sweden | Swedish krona (SEK) |
| Swiss | Liechtenstein | Swiss franc (CHF) |
| Swiss | Switzerland | Swiss franc (CHF) |
| SYP | Syria | Syrian pound (SYP) |
| Syrian | Syria | Syrian pound (SYP) |
| SZL | Swaziland | lilangeni (SZL) |
| Taiwan | Taiwan | new Taiwan dollar (TWD) |
| taka | Bangladesh | taka (BDT) |
| tala | Samoa | tala (SAT) |
| Tanzanian | Tanzania | Tanzanian shilling (TZS) |
| tender | Guernsey | Guernsey pound note: the British pound is also legal tender |
| tender | Isle of Man | Isle of Man pound (IMP), also known as the Manx pound note: the British pound is also legal tender, but change is given in IMP |
| tender | Jersey | Jersey pound note: the British pound is also legal tender |
| tenge | Kazakhstan | tenge (KZT) |
| THB | Thailand | baht (THB) |
| TJS | Tajikistan | somoni (TJS) |
| TMM | Turkmenistan | Turkmen manat (TMM) |
| TND | Tunisia | Tunisian dinar (TND) |
| Tobago | Trinidad and Tobago | Trinidad and Tobago dollar (TTD) |
| togrog | Mongolia | togrog/tugrik (MNT) |
| tolar | Slovenia | euro (EUR) note: on 1 January 2007, the euro became Slovenia's currency; both the tolar and the euro were in circulation from 1 January until 15 January 2007 |
| TOP | Tonga | pa'anga (TOP) |
| transactions | Austria | ... the euro as a common currency to be used by financial institutions of member countries; on 1 January 2002, the euro became the sole currency for everyday transactions within the member countries |
| transactions | Belgium | ... the euro as a common currency to be used by financial institutions of member countries; on 1 January 2002, the euro became the sole currency for everyday transactions within the member countries |
| transactions | Finland | ... the euro as a common currency to be used by financial institutions of member countries; on 1 January 2002, the euro became the sole currency for everyday transactions within the member countries |