Public holidays
1644, United Kingdom, Northern Ireland
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1644 | New Year's Day |
| 2 | Thursday, 17 March 1644 | St. Patrick's Day |
| 3 | Friday, 25 March 1644 | Good Friday |
| 4 | Monday, 28 March 1644 | Easter Monday |
| 5 | Monday, 30 May 1644 | Spring Bank Holiday |
| 6 | Tuesday, 12 July 1644 | Orangemen's Day |
| 7 | Monday, 29 August 1644 | Late Summer Bank Holiday |
| 8 | Monday, 26 December 1644 | Boxing Day |
| 9 | Tuesday, 27 December 1644 | Christmas Day (substitute day) |