The National Order of the Arrow Conference (NOAC) is a multi-day event which usually takes place on a university campus east of the Mississippi River, bringing together thousands of delegates from Order of the Arrow lodges around the nation for training and activities.

NOACs are held every two years, with exceptions made to align the event with significant anniversaries.

In particular, the deferral from 2008 to 2009 aligned the schedule with the Order of the Arrow's 100th anniversary in 2015 and avoided a conflict with the 2010 National Scout Jamboree (which was similarly deferred from 2009 to align its schedule with the Boy Scouts of America's 100th anniversary in 2010).

The 2020 conference also had to be delayed to 2022 due to COVID-19, with people up to age 23 allowed to attend instead of 21.

The Grand Lodge Meeting was delayed from 1935 to 1936 to avoid a conflict with the planned 1935 National Jamboree.