National Sibling Day 2026 in Japan is observed on 金曜日, 10 4月 2026.
National Sibling Day is a public holiday in Japan. This page collects the date for each year, plus other holidays in the country's calendar.
National Sibling Day is officially observed as a public holiday in Japan. We are building out a longer history & traditions section for this holiday. In the meantime, the calendar below shows National Sibling Day's date across multiple years and how it interacts with the country's long-weekend opportunities.
National Sibling Day observance varies by community and region within Japan. Government offices, banks, and schools are typically closed.
National Sibling Day 2026 in Japan is observed on 金曜日, 10 4月 2026.
No. National Sibling Day is marked in Japan as a widely observed day, but it is not an official public holiday — workplaces and schools stay open.
The countdown above shows the exact days, hours and minutes remaining. The year-by-year list below has National Sibling Day's date in the surrounding years.