Public holidays
1644, United Kingdom, Ireland
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1644 | New Year's Day |
| 2 | Thursday, 17 March 1644 | St. Patrick's Day |
| 3 | Monday, 28 March 1644 | Easter Monday |
| 4 | Monday, 2 May 1644 | Early May Bank Holiday |
| 5 | Monday, 6 June 1644 | June Bank Holiday |
| 6 | Monday, 1 August 1644 | Summer Bank Holiday |
| 7 | Monday, 31 October 1644 | October Bank Holiday |
| 8 | Monday, 26 December 1644 | Christmas Day (substitute day) |
| 9 | Tuesday, 27 December 1644 | St. Stephen's Day (substitute day) |