David Faimafiliotamaʻitaʻi Ainuʻu (born 20 November 1999) is a rugby union player who plays as a prop for Toulouse in France's Top14 and for the United States men's national team. Ainuʻu has also represented the United States with multiple age-grade sides—including the United States national under-20 rugby union team.
David Ainuʻu was born in American Samoa on 20 November 1999. Ainuʻu was first introduced to rugby when he was the water boy for his brother's team. He first played rugby himself with Prairie RFC in Yelm, Washington. Ainuʻu was also selected to play for the Washington Loggers, Rugby Washington's state-level representative side. Ainuʻu attended Capital High School in Olympia, Washington.
Prior to December 2017, Ainuʻu played rugby for Seattle Saracens in the CDI Premier League. In December 2017, Ainuʻu signed a six-month academy contract with Toulouse in France's Top14. (Ainuʻu had previously agreed to join the Seattle Seawolves for Major League Rugby's inaugural 2018 season, but ended that agreement before the season began in order to play at the higher-level of competition.) In September 2018, Ainuʻu re-signed with Toulouse, committing to the club through the 2020–21 season. Ainuʻu made his Top 14 debut for Toulouse on 23 September 2018, appearing as a halftime-substitute in a 66–15 defeat to Montpellier.