National and Other Holidays
May 2015
| Date | Weekday | Holiday | Type | Where Observed |
| 1 | Friday | Law Day | Observed | |
| 1 | Friday | Loyalty Day | Observed | |
| 2 | Saturday | National Explosive Ordinance Disposal (EOD) Day | Observed | |
| 4 | Monday | Rhode Island Independence Day | Observed | Local RI |
| 5 | Tuesday | Cinco de Mayo | Observed | |
| 5 | Tuesday | Primary Election Day Indiana | State | IN |
| 6 | Wednesday | National Nurses Day | Observed | |
| 7 | Thursday | Lag BaOmer | Jewish | |
| 7 | Thursday | Natonal Day of Prayer | Observed | |
| 8 | Friday | Truman Day | State | MO |
| 10 | Sunday | Mother's Day | Observed | |
| 10 | Sunday | Confederate Memorial Day | Observed | Local NC |
| 10 | Sunday | Confederate Memorial Day | State | SC |
| 11 | Monday | Confederate Memorial Day (observed) | State | SC |
| 14 | Thursday | Ascension Day | Christian | |
| 15 | Friday | Peace Officers Memorial Day | Observed | |
| 15 | Friday | National Defense Transportation Day | Observed | |
| 16 | Saturday | Isra and Mi'raj | Muslim | |
| 16 | Saturday | Armed Forces Day | Observed | |
| 20 | Wednesday | Emergency Medical Services for Children Day | Observed | |
| 22 | Friday | National Maritime Day | Observed | |
| 22 | Friday | Harvey Milk Day | Observed | Local CA |
| 24 | Sunday | Pentecost | Christian | |
| 24 | Sunday | Shavuot | Jewish | |
| 25 | Monday | Whit Monday | Christian | |
| 25 | Monday | Memorial Day | National | |
| 31 | Sunday | Trinity Sunday | Christian | |
