The Holy Family BC fighter was the 99th flag bearer of 207 emblem carriers leading their teams at the Parade of Nations at the famed football venue.
An estimated TV audience of 3 billion observed proceedings.
Barnes was following in the footsteps of the Irish flag bears of Olympiads past and current, including Matt Flanagan (Amsterdam 1928, Garda BC), Tony “Socks” Byrne (Melbourne 1956, Tredagh BC), Jim McCourt (Mexico City 1968, Immaculata BC), Wayne McCullough (Seoul 1988, Albert Foundry BC), Francie Barrett (Atlanta 1996, Olympic BC) and Katie Taylor (London 2012, Bray BC).
“All of us have worked so hard to get to this point,but now it is time to really deliver,”added Barnes ahead of the ceremony.
“I’m going to enjoy the occasion of course, but I can’t wait to get in the ring for my first bout and start my quest for gold.”
Barnes was one of nine boxers to lead out their nation this evening, along with Azerbaijan’s Teymur Mammadov, Dieudonne Wilfried Seyi Ntsengue of Cameroon, Jennifer Chieng for Federated States of Micronesia, Iraq’s Waheed Abdulridha, Jordan’s Hussein Eshaish Iashaish, Erkin Adylbek Uulu of Kyrgyzstan, Jonas Junias for Namibia and Uzbekistan’s Bakhodir Jalolov.
Cheing received an invitation place in Katie Taylor’s lightweight class from the Tripartite Commission.
“We’ve got our greatest female athlete, Katie Taylor, going for her second gold medal; Paddy Barnes in his third Games is going for his third medal, what an athlete,” said ex WBA World champion Bernard Dunne on tonight’s live Opening cermony broadcast on RTÉ.
“Michael Conlan,(Steven) Donnelly,(Brendan) Irvine,(David Oliver) Joyce, big Joe Ward – that is the best boxing team we’ve sent to a Games.”
The Opening Ceremony marks the official start of the 2016 Olympic Games, althought the football tournament started midweek.
Steven Donnelly and David Oliver Joyce get Ireland’s campaign in the boxing ring underway at the 9,000 seater Riocentro venue on Sunday.
— Team Ireland (@olympiccouncil) August 6, 2016