Most participants at a Summer Olympic Games

According to Official Guinness Records,

The most participants at a Summer Olympic Games celebration is 11,238 athletes, from 207 countries, at the games held in Rio de Janeiro, Brazil in 2016.Rio Olympic Games is also the record holder of most countries participating at a Summer Olympic Games and most medals awarded at one Olympic Games.

For a complete list of 2016 records, please visit 2016 Guinness Records in Brazil.

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Other Brazil records that might interest you:

• Most medals awarded at one Olympic Games
• Largest fruit display
• Longest Stand Up Paddleboard (SUP) ride on a river bore by a human/dog pair
• Fastest speed on inline skates (rollerblades) - downhill
• Most skateboard rail flip to rail in one minute