Below are holidays for the calendar year 2021. Holidays that are in bold are both National and prominent holidays. You can get more detailed information on each holiday by clicking on them.
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| Date | Holiday | Details |
|---|---|---|
| - January 2021 - | ||
| Jan 1 - Friday | New Year's Day 2021 | National holiday |
| Jan 6 - Wednesday | Epiphany 2021 | Christian |
| Jan 7 - Thursday | Orthodox Christmas Day 2021 | Orthodox Christian |
| Jan 14 - Thursday | Orthodox New Year 2021 | Orthodox Christian |
| Jan 14 - Thursday | Makar Sankranti 2021 | Hindu |
| Jan 18 - Monday | Martin Luther King Day 2021 | National holiday |
| Jan 28 - Thursday | Tu B'Shevat 2021 | Jewish |
| - February 2021 - | ||
| Feb 1 - Monday | National Freedom Day 2021 | Observance |
| Feb 2 - Tuesday | Groundhog Day 2021 | Observance |
| Feb 5 - Friday | National Wear Red Day 2021 | Observance |
| Feb 12 - Friday | Chinese New Year 2021 | Observance |
| Feb 12 - Friday | Lincoln's Birthday 2021 | Observance |
| Feb 14 - Sunday | Valentine's Day 2021 | Observance |
| Feb 15 - Monday | Presidents' Day - Washington's Birthday 2021 | National holiday |
| Feb 16 - Tuesday | Mardi Gras 2021 | Christian |
| Feb 17 - Wednesday | Ash Wednesday 2021 | Christian |
| Feb 17 - Wednesday | Lent 2021 | Christian |
| Feb 27 - Saturday | Purim 2021 | Jewish |
| - March 2021 - | ||
| Mar 2 - Tuesday | Read Across America Day 2021 | Observance |
| Mar 5 - Friday | Employee Appreciation Day 2021 | Observance |
| Mar 11 - Thursday | Maha Shivaratri 2021 | Hindu |
| Mar 11 - Thursday | Isra and Mi'raj 2021 | Muslim |
| Mar 14 - Sunday | Daylight Saving Time - begins 2021 | Daylight Saving |
| Mar 17 - Wednesday | St. Patrick's Day 2021 | Observance |
| Mar 20 - Saturday | Spring/Fall - March equinox 2021 | Season |
| Mar 28 - Sunday | Palm Sunday 2021 | Christian |
| Mar 28 - Sunday | Passover - Starts 2021 | Jewish |
| Mar 29 - Monday | Laylat al Bara'at 2021 | Muslim |
| Mar 29 - Monday | Holi 2021 | Hindu |
| - April 2021 - | ||
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| Apr 1 - Thursday | April Fools' Day 2021 | Observance |
| Apr 1 - Thursday | Maundy Thursday 2021 | Christian |
| Apr 2 - Friday | Good Friday 2021 | Christian |
| Apr 3 - Saturday | Holy Saturday 2021 | Christian |
| Apr 4 - Sunday | Easter 2021 | Christian |
| Apr 4 - Sunday | Passover - Final Day 2021 | Jewish |
| Apr 5 - Monday | Easter Monday 2021 | Christian |
| Apr 8 - Thursday | Yom Hashoah 2021 | Jewish |
| Apr 13 - Tuesday | National Library Workers Day 2021 | Observance |
| Apr 13 - Tuesday | Thomas Jefferson Birthday 2021 | Observance |
| Apr 13 - Tuesday | Ramadan starts 2021 | Muslim |
| Apr 15 - Thursday | Tax Day 2021 | Observance |
| Apr 21 - Wednesday | Rama Navami 2021 | Hindu |
| Apr 21 - Wednesday | Administrative Professionals Day 2021 | Observance |
| Apr 22 - Thursday | Take our Daughters and Sons to Work Day 2021 | Observance |
| Apr 22 - Thursday | Earth Day 2021 | Observance |
| Apr 30 - Friday | Orthodox Good Friday 2021 | Orthodox Christian |
| Apr 30 - Friday | Arbor Day 2021 | Observance |
| Apr 30 - Friday | Lag BaOmer 2021 | Jewish |
| - May 2021 - | ||
| May 1 - Saturday | May Day 2021 | Observance |
| May 2 - Sunday | Orthodox Easter 2021 | Orthodox Christian |
| May 5 - Wednesday | Cinco de Mayo 2021 | Observance |
| May 6 - Thursday | National Nurses Day 2021 | Observance |
| May 6 - Thursday | National Day of Prayer 2021 | Observance |
| May 9 - Sunday | Laylat al Qadr 2021 | Muslim |
| May 9 - Sunday | Mothers' Day 2021 | Observance |
| May 13- Thursday | Eid al-Fitr 2021 | Muslim |
| May 13 - Thursday | Ascension Day 2021 | Christian |
| May 15 - Saturday | Peace Officers Memorial Day 2021 | Observance |
| May 15 - Saturday | Armed Forces Day 2021 | Observance |
| May 17 - Monday | Shavuot 2021 | Jewish |
| May 22 - Saturday | National Maritime Day 2021 | Observance |
| May 23 - Sunday | Pentecost 2021 | Christian |
| May 24 - Monday | Whit Monday 2021 | Christian |
| May 31 - Monday | Memorial Day 2021 | National holiday |
| - June 2021 - | ||
| Jun 3 - Thursday | Corpus Christi 2021 | Christian |
| Jun 6 - Sunday | D-Day 2021 | Observance |
| Jun 14 - Monday | Flag Day 2021 | Observance |
| Jun 20 - Sunday | Fathers' Day 2021 | Observance |
| Jun 20 - Sunday | Summer/Winter Solstice 2021 | Season |
| - July 2021 - | ||
| Jul 4 - Sunday | 4th of July - Independence Day 2021 | National holiday |
| Jul 11 - Sunday | Rath Yatra 2021 | Hindu |
| Jul 18 - Sunday | Tisha B'Av 2021 | Jewish |
| Jul 19 - Monday | Day of Arafat 2021 | Muslim |
| Jul 20 - Tuesday | Eid al-Adha 2021 | Muslim |
| Jul 25 - Sunday | Parents Day 2021 | Observance |
| - August 2021 - | ||
| Aug 1 - Sunday | Friendship Day 2021 | Observance |
| Aug 10 - Tuesday | Muharram 2021 | Muslim |
| Aug 15 - Sunday | Assumption of Mary 2021 | Christian |
| Aug 19 - Thursday | National Aviation Day 2021 | Observance |
| Aug 19 - Thursday | Ashura 2021 | Muslim |
| Aug 21 - Saturday | Raksha Bandhan 2021 | Hindu |
| Aug 21 - Saturday | Senior Citizens Day 2021 | Observance |
| Aug 26 - Thursday | Women's Equality Day 2021 | Observance |
| Aug 29 - Sunday | Krishna Janmashtami 2021 | Hindu |
| - September 2021 - | ||
| Sep 6 - Monday | Labor Day 2021 | National holiday |
| Sep 7 - Tuesday | Rosh Hashana 2021 | Jewish |
| Sep 9 - Thursday | Ganesh Chaturthi 2021 | Hindu |
| Sep 11 - Saturday | Patriot Day 2021 | Observance |
| Sep 12 - Sunday | National Grandparents Day 2021 | Observance |
| Sept 16 - Thursday | Yom Kippur 2021 | Jewish |
| Sep 17 - Friday | Constitution Citizenship Day 2021 | Observance |
| Sep 21- Tuesday | Sukkot 2021 | Jewish |
| Sep 22 - Wednesday | Fall/ Spring - September equinox 2021 | Season |
| Sep 28 - Tuesday | Shemini Atzeret 2021 | Jewish |
| Sep 29 - Wednesday | Simchat Torah 2021 | Jewish |
| - October 2021 - | ||
| Oct 4 - Monday | Child Health Day 2021 | Observance |
| Oct 6 - Wednesday | Navratri 2021 | Hindu |
| Oct 9 - Saturday | Leif Erikson 2021 | Observance |
| Oct 11 - Monday | Columbus Day 2021 | National holiday |
| Oct 14 - Thursday | Dussehra 2021 | Hindu |
| Oct 15 - Friday | Boss's Day 2021 | Observance |
| Oct 19 - Thursday | The Prophet's Birthday 2021 | Muslim |
| Oct 31 - Sunday | Halloween 2021 | Observance |
| - November 2021 - | ||
| Nov 1 - Monday | All Saints' Day 2021 | Christian |
| Nov 2 - Tuesday | All Souls Day 2021 | Christian |
| Nov 4 - Thursday | Diwali 2021 | Hindu |
| Nov 7 - Sunday | Daylight Saving Time - ends 2021 | Daylight Saving |
| Nov 11 - Thursday | Veterans Day 2021 | National holiday |
| Nov 25 - Thursday | Thanksgiving Day 2021 | National holiday |
| Nov 26 - Friday | Black Friday 2021 | Observance |
| Nov 28 - Sunday | Advent 2021 | Christian |
| Nov 29 - Monday | Cyber Monday 2021 | Observance |
| Nov 29 - Monday | Hanukkah/Chanukah - Starts 2021 | Jewish |
| - December 2021 - | ||
| Dec 6 - Monday | St Nicholas Day 2021 | Christian |
| Dec 6 - Monday | Hanukkah/Chanukah - Final Day 2021 | Jewish |
| Dec 7 - Tuesday | Pearl Harbor Remebrance Day 2021 | Observance |
| Dec 17 - Friday | Wright Brothers Day 2021 | Observance |
| Dec 21 - Tuesday | Winter/Summer Solstice 2021 | Season |
| Dec 24 - Friday | Christmas Eve 2021 | Christian |
| Dec 25 - Saturday | Christmas Day 2021 | National holiday |
| Dec 26 - Sunday | Kwanzaa -thru Jan 1 2021 | Observance |
| Dec 31 - Friday | New Years Eve 2021 | Observance |