Austin O'Connor finished 17th in the individual jumping final as Ireland finished ninth overall on the final day of eventing at the Chateau de Versailles.
The Corkman aboard Colorado Blue was 14th going into Monday's third day of eventing action which followed the dressage and cross-country phases and the four-time Olympian needed to be in the top 25 to make this afternoon's individual jump final.
O'Connor incurred eight faults but ultimately advanced to the jump final in 21st place with a total score of 39.70.
He posted a clear round in the finale to take 17th position.
German Michael Jung and Australian Christopher Burton enjoyed perfect rounds to take gold and silver.
Laura Collett has won a bronze medal for Britain.
Also riding for Ireland on the final day of the event was Susie Berry who was 31st overall on 52.20 with horse Wellfields Lincoln.
Aoife Clark replaced Sarah Ennis for the jumping round after a minor injury to Lady M Action after Sunday's cross-country phase and she had four faults as Ireland finished ninth in Team Eventing with a score of 157.10.
"I'm thrilled with the mare, the rail down was really my fault unfortunately. I just got her in too deep.
"She wouldn’t have had the experience of Master Crusoe who I had at London, but she was amazing."
Clark said that when she competed and the London Games in 2012 she did not pay attention to the spectacle of the event but made sure to this time around.
"Jumped two clear rounds at London, probably didn’t really notice the crowd then and everything. Today I actually went in, looked around and thought 'I’m going to enjoy this’.
"It’s an amazing setting, fabulous course and it was really fun to ride," she said.
Clark only found out yesterday that she would be replacing Sarah Ennis.
"I’m so sorry for Sarah, she did a brilliant round yesterday. Thankfully her mare will be OK, it’s just a small injury that’s ruled her out of today.
She added: "That’s the difficulty of this position, you have to be ready everyday - even yesterday should something go wrong I was ready to ride cross-county.
"We’re all competitors, we’re used to being ready to run and sometimes with horses things go wrong."
Great Britain won gold, while host nation France and Japan took silver and bronze respectively.
Britain finished on 91.30 penalties, ahead of the French in second on 103.6 and Japan in third on 115.80.
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