The Suiko period was an era of 25 years during the Asuka period of Japanese history. This period overlaps all but 7 years of Empress Suiko's reign (604-628) or it is used as a synonym for her reign (593-628).
The adoption of the sexegenary cycle calendar (Jikkan Jūnishi) was a significant event in the reign of Empress Suiko. This pre-dates the system of Japanese era names (年号,, nengō,; lit. "year name") which was started in 645.
| Suiko period | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th | 11th | 12th | 13th | 14th | 15th | 16th | 17th | 18th | 19th | 20th | 21th | 22th | 23th | 24th | 25th |
| Gregorian | 604 | 605 | 606 | 607 | 608 | 609 | 610 | 611 | 612 | 613 | 614 | 615 | 616 | 617 | 618 | 619 | 620 | 621 | 622 | 623 | 624 | 625 | 626 | 627 | 628 |
| Preceded by: —— 593-604 |
Imperial reign: Suiko period 604–628 |
Succeeded by: Jomei period 629-641 |