OSN (National Science Olympiad) is a competition for high school indonesians, and is a preliminary round in the selection for the International Science Olympiad teams (IMO, IOI, IPhO, etc.)

The first round of the OSN is the OSN-K (city level), scheduled to be held at 18-19 June 2026. The guidebook stated that the announcement is scheduled for 3 July.

Resolves YES if and only if the announcement is at 3 July or before, local time.