Riders from 40 countries will contest the equestrian events at London 2012.
The sport's governing body, the Federation Equestre International (FEI), hasconfirmed the breakdown of entries.
The three disciplines - eventing, dressage and showjumping - will take place at Greenwich Park between July 28 and August 9.
And for the first time in an Olympic Games, there will be more nations contesting dressage than eventing.
Showjumping remains the strongest discipline with 26 countries, but dressage has 24 nations entered, compared with 23 for eventing.
Seven countries - Great Britain, Australia, Canada, Germany, Holland, Sweden and the United States - have teams in all three disciplines, with Britain, Germany and Holland qualifying a maximum 13 riders.
The British contingent comprises eventers William Fox-Pitt, Mary King, Zara Phillips, Tina Cook and Nicola Wilson, a dressage quartet of Carl Hester, Laura Bechtolsheimer, Charlotte Dujardin and Richard Davison, plus showjumpers Nick Skelton, Ben Maher, Scott Brash and Peter Charles.
Individual sport breakdowns will see 13 countries contesting eventing team medals, 10 in dressage and 15 in showjumping, with a total of 200 riders - 124 male and 76 female - heading to London.