| Holiday Name: | Federal Day of Thanksgiving, Repentance and Prayer |
| Official Name: | German: Eidgenössischer Dank-, Buss- und Bettag, French: Jeûne fédéral, Italian: Digiuno federale, Romansh: Rogaziun federala |
| Nickname: | German: Bettag |
| Observedby: | Switzerland, except in the canton of Geneva |
| Week Ordinal: | third |
| Weekday: | Sunday |
| Month: | September |
| Duration: | 1 day |
| Scheduling: | nth weekday of the month |
| Frequency: | annual |
| Relatedto: | Lundi du Jeûne fédéral, Jeûne genevois |
The Federal Day of Thanksgiving, Repentance and Prayer (German: Eidgenössischer Dank-, Buss- und Bettag, French: Jeûne fédéral, Italian: Digiuno federale) is a public holiday in Switzerland. It is an interfaith feast observed by Roman Catholic dioceses, the Old Catholic Church, the Jewish and Muslim congregations and the Reformed church bodies as well as other Christian denominations.
It is celebrated on the third Sunday in September. In the Canton of Geneva another comparable fast, the Jeûne genevois, is celebrated.
The subsequent Monday (Lundi du Jeûne) is a public holiday in the canton of Vaud and unofficial holiday in the canton of Neuchâtel.