| 1/1/1973, Mon | New Year's Day |
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| 3/3/1973, Sat | National Liberation Day |
- Note
- An official holiday commemorating the 3 March 1878 Treaty of San Stefano and Bulgaria's liberation from Ottoman rule.
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| 3/5/1973, Mon | National Liberation Day: Additional Observance Day |
- Note
- An official holiday commemorating the 3 March 1878 Treaty of San Stefano and Bulgaria's liberation from Ottoman rule.
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| 4/27/1973, Fri | Good Friday |
- Note
- An official holiday (Veliki petak / Orthodox Good Friday).
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| 4/28/1973, Sat | Holy Saturday |
- Note
- An official holiday (Velika sabota / Orthodox Holy Saturday).
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| 4/29/1973, Sun | Easter Sunday |
- Note
- An official holiday (Velikden / Orthodox Easter Sunday).
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| 4/30/1973, Mon | Easter Monday |
- Note
- An official holiday (Vtori den Velikden / Orthodox Easter Monday).
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| 5/1/1973, Tue | Labour Day |
- Note
- An official holiday (Den na truda). International Workers' Day.
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| 5/6/1973, Sun | St. George's Day / Bulgarian Armed Forces Day |
- Note
- An official holiday (Gergyovden). Commemorates St. George and the Bulgarian Armed Forces.
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| 5/7/1973, Mon | St. George's Day / Bulgarian Armed Forces Day: Additional Observance Day |
- Note
- An official holiday (Gergyovden). Commemorates St. George and the Bulgarian Armed Forces.
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| 5/24/1973, Thu | 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.
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| 9/6/1973, Thu | Bulgarian Unification Day |
- Note
- An official holiday (Den na Saedinenieto). Commemorates the 6 September 1885 unification of the Principality of Bulgaria with Eastern Rumelia.
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| 9/22/1973, Sat | Bulgarian Independence Day |
- Note
- An official holiday (Den na Nezavisimostta). Commemorates Bulgaria's declaration of independence from the Ottoman Empire on 22 September 1908.
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| 9/24/1973, Mon | Bulgarian Independence Day: Additional Observance Day |
- Note
- An official holiday (Den na Nezavisimostta). Commemorates Bulgaria's declaration of independence from the Ottoman Empire on 22 September 1908.
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| 12/24/1973, Mon | Christmas Eve |
- Note
- An official holiday (Badni Vecher / Christmas Eve).
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| 12/25/1973, Tue | Christmas Day |
- Note
- An official holiday (Rozhdestvo Hristovo / Christmas Day 1).
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| 12/26/1973, Wed | Second Day of Christmas |
- Note
- An official holiday (Christmas Day 2).
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