Open class is a track and field event classification defined by World Athletics and USA Track & Field.^[1]

The classification is defined as:

• Having no maximum age limit
• Men's long distance running is limited to male athletes sixteen (16) years and older on the day of the competition.
• Men's race walking and all women's competition, athletes shall be fourteen (14) years or older on the day of the competition

• Under-18 athletics
• Under-20 athletics
• Under-23 athletics

• 2009 Competition Rules