| 1/1/1977, Sat | New Year's Day |
|
| 1/3/1977, Mon | New Year's Day: Additional Observance Day |
|
| 3/3/1977, Thu | National Liberation Day |
- Note
- An official holiday commemorating the 3 March 1878 Treaty of San Stefano and Bulgaria's liberation from Ottoman rule.
|
| 4/8/1977, Fri | Good Friday |
- Note
- An official holiday (Veliki petak / Orthodox Good Friday).
|
| 4/9/1977, Sat | Holy Saturday |
- Note
- An official holiday (Velika sabota / Orthodox Holy Saturday).
|
| 4/10/1977, Sun | Easter Sunday |
- Note
- An official holiday (Velikden / Orthodox Easter Sunday).
|
| 4/11/1977, Mon | Easter Monday |
- Note
- An official holiday (Vtori den Velikden / Orthodox Easter Monday).
|
| 5/1/1977, Sun | Labour Day |
- Note
- An official holiday (Den na truda). International Workers' Day.
|
| 5/2/1977, Mon | Labour Day: Additional Observance Day |
- Note
- An official holiday (Den na truda). International Workers' Day.
|
| 5/6/1977, Fri | St. George's Day / Bulgarian Armed Forces Day |
- Note
- An official holiday (Gergyovden). Commemorates St. George and the Bulgarian Armed Forces.
|
| 5/24/1977, Tue | Day of Cyril and Methodius (Bulgarian Education/Culture) |
- Note
- An official holiday (Den na balgarskata prosveta i kultura). Commemorates Sts. Cyril and Methodius, creators of the Cyrillic alphabet.
|
| 9/6/1977, Tue | Bulgarian Unification Day |
- Note
- An official holiday (Den na Saedinenieto). Commemorates the 6 September 1885 unification of the Principality of Bulgaria with Eastern Rumelia.
|
| 9/22/1977, Thu | Bulgarian Independence Day |
- Note
- An official holiday (Den na Nezavisimostta). Commemorates Bulgaria's declaration of independence from the Ottoman Empire on 22 September 1908.
|
| 12/24/1977, Sat | Christmas Eve |
- Note
- An official holiday (Badni Vecher / Christmas Eve).
|
| 12/25/1977, Sun | Christmas Day |
- Note
- An official holiday (Rozhdestvo Hristovo / Christmas Day 1).
|
| 12/26/1977, Mon | Christmas Eve: Additional Observance Day |
- Note
- An official holiday (Badni Vecher / Christmas Eve).
|
| 12/26/1977, Mon | Christmas Day: Additional Observance Day |
- Note
- An official holiday (Rozhdestvo Hristovo / Christmas Day 1).
|
| 12/26/1977, Mon | Second Day of Christmas |
- Note
- An official holiday (Christmas Day 2).
|