1866 Holidays and Events in Northern Ireland
| Additional Information | Date | Name |
|---|---|---|
| 1/1/1866, Mon | New Year's Day | |
| 3/25/1866, Sun | Palm Sunday | |
| 3/30/1866, Fri | Good Friday | |
| 3/31/1866, Sat | Holy Saturday | |
| 4/1/1866, Sun | Easter | |
| 4/2/1866, Mon | Easter Monday | |
| 5/7/1866, Mon | Early May Bank Holiday | |
| 5/28/1866, Mon | Spring Bank Holiday | |
| 6/9/1866, Sat | Queen's Birthday | |
| 7/12/1866, Thu | Orangeman's Day & Parade | |
| 8/27/1866, Mon | Summer Bank Holiday | |
| 10/31/1866, Wed | Halloween | |
| 12/24/1866, Mon | Christmas Eve | |
| 12/25/1866, Tue | Christmas Day | |
| 12/26/1866, Wed | Boxing Day | |
| 12/31/1866, Mon | New Year's Eve |