Events in June 1866
| MonMonday | TueTuesday | WedWednesday | ThuThursday | FriFriday | SatSaturday | SunSunday |
|---|
| 2828 May 1866 | 2929 May 1866 | 3030 May 1866 | 3131 May 1866 | 11 June 1866 | 22 June 1866 | 33 June 1866 |
| 44 June 1866 | 55 June 1866 | 66 June 1866 | 77 June 1866 | 88 June 1866 | 99 June 1866 | 1010 June 1866 |
| 1111 June 1866 | 1212 June 1866 | 1313 June 1866 | 1414 June 1866 | 1515 June 1866 | 1616 June 1866 | 1717 June 1866 |
| 1818 June 1866 | 1919 June 1866 | 2020 June 1866 | 2121 June 1866 | 2222 June 1866 | 2323 June 1866 | 2424 June 1866 |
| 2525 June 1866 | 2626 June 1866 | 2727 June 1866 | 2828 June 1866 | 2929 June 1866 | 3030 June 1866 | 11 July 1866 |