Uini Atonio (Samoan: [wini atoniːo]; born 26 March 1990) is a professional rugby union player who plays as a prop for Top 14 club La Rochelle.

[7] On 1 July 2011, Atonio joined French club La Rochelle after then-head coach Patrice Collazo spotted him at a rugby tens tournament in Hong Kong in 2010.

[13][14][15] On 28 May 2022, he led La Rochelle to an epic 21-24 win against Leinster in the 2021–22 European Rugby Champions Cup final at Stade Vélodrome in Marseille, playing more than sixty minutes and earning his first major trophy with the club.

[19] In 2014, he was called up to the France national team for the 2014 Autumn internationals after completing the required three years of residency and made his debut on 8 November in a 40–15 win over Fiji in Marseille.

[21] In 2022, Atonio was included in the squad for the 2022 Six Nations Championship, played in all five games as a starter and won the first French Grand Slam since 2010 after finishing in second place a year ago.