1978 Holidays
| Holidays 1978 | Week Day | Date |
| New Year's Day | Sunday | January 1, 1978 |
| New Year's Day (Observed) | Monday | January 2, 1978 |
| Epiphany | Friday | January 6, 1978 |
| Martin Luther King Jr's Day | Monday | January 16, 1978 |
| Ground Hog Day | Thursday | February 2, 1978 |
| Ash Wednesday | Wednesday | February 8, 1978 |
| Valentine's Day | Tuesday | February 14, 1978 |
| President's Day | Monday | February 20, 1978 |
| Saint Patrick's Day | Friday | March 17, 1978 |
| Palm Sunday | Sunday | March 19, 1978 |
| Good Friday | Friday | March 24, 1978 |
| Easter | Sunday | March 26, 1978 |
| Easter Monday | Monday | March 27, 1978 |
| Income Tax Day | Saturday | April 15, 1978 |
| Earth Day | Saturday | April 22, 1978 |
| Arbor Day | Friday | April 28, 1978 |
| Cinco de Mayo | Friday | May 5, 1978 |
| Mother's Day | Sunday | May 14, 1978 |
| National Maritime Day | Monday | May 22, 1978 |
| National Missing Children's Day | Thursday | May 25, 1978 |
| Memorial Day | Monday | May 29, 1978 |
| D-Day | Tuesday | June 6, 1978 |
| Flag Day | Wednesday | June 14, 1978 |
| Father's Day | Sunday | June 18, 1978 |
| Independence Day | Tuesday | July 4, 1978 |
| Labor Day | Monday | September 4, 1978 |
| Grandparent's Day | Sunday | September 10, 1978 |
| Patriot Day | Monday | September 11, 1978 |
| Columbus Day | Monday | October 9, 1978 |
| Halloween | Tuesday | October 31, 1978 |
| All Saints' Day | Wednesday | November 1, 1978 |
| All Souls' Day | Thursday | November 2, 1978 |
| Election Day | Tuesday | November 7, 1978 |
| Veteran's Day | Saturday | November 11, 1978 |
| Thanksgiving Day | Thursday | November 23, 1978 |
| Black Friday | Friday | November 24, 1978 |
| Cyber Monday | Monday | November 27, 1978 |
| Pearl Harbor Day | Thursday | December 7, 1978 |
| Feast of the Immaculate Conception | Friday | December 8, 1978 |
| Christmas Eve | Sunday | December 24, 1978 |
| Christmas Day | Monday | December 25, 1978 |
| New Year's Eve | Sunday | December 31, 1978 |