Click on the April holidays listed in blue for more details.
| Holidays | Date | Details |
|---|---|---|
| April Fools Day 2021 | Apr 1 - Thursday | Observance |
| Maundy Thursday 2021 | Apr 1 - Thursday | Christian |
| Good Friday 2021 | Apr 2 - Friday | Christian |
| Holy Saturday 2021 | Apr 3 - Saturday | Christian |
| Easter 2021 | Apr 4 - Sunday | Christian |
| Passover Ends - 2021 | Apr 4 - Sunday | Jewish |
| Easter Monday 2021 | Apr 5 - Monday | Christian |
| Yom Hashoah 2021 | Apr 8 - Thursday | Jewish |
| National Library Workers Day 2021 | Apr 13 - Tuesday | Observance |
| Thomas Jefferson Birthday 2021 | Apr 13 - Tuesday | Observance |
| Ramadan Starts - 2021 | Apr 13 - Tuesday | Muslim |
| Tax Day 2021 | Apr 15 - Thursday | Observance |
| Rama Navami 2021 | Apr 21 - Wednesday | Hindu |
| Administrative Professionals Day 2021 | Apr 21 - Wednesday | Observance |
| Earth Day 2021 | Apr 22 - Thursday | Observance |
| Take our Daughters and Sons to Work Day 2021 | Apr 22 - Thursday | Observance |
| Arbor Day 2021 | Apr 30 - Friday | Observance |
| Orthodox Good Friday 2021 | Apr 30 - Friday | Orthodox |
| Lag BaOmer 2021 | Apr 30 - Friday | Jewish |
