Fourteen athletes on the Thai roster competed at London 2012, including badminton star Boonsak Ponsana (men's singles) and table tennis player Nanthana Komwong, both of whom made their historic fifth Olympic appearance as the most experienced competitors on the team.

One Thai archer qualified for the men's individual recurve at the Olympics by virtue of a top five national finish at the 2016 Archery World Cup meet in Antalya, Turkey.

[10][11] Meanwhile, 2012 Olympians Chatchai Butdee and Sailom Adi had claimed their Olympic spots at the 2016 Asia & Oceania Qualification Tournament in Qian'an, China.

Kunathip Yea-on earned a continental quota spot from the Asian region, as the highest-ranked Thai judoka outside of direct qualifying position in the IJF World Ranking List of May 30, 2016.

[19][20] Thailand has qualified one boat each in the men's and women's single sculls at the 2016 Asia & Oceania Continental Qualification Regatta in Chungju, South Korea.

Suthasini Sawettabut and incoming five-time Olympian Nanthana Komwong scored a second-stage victory each to book two out of six remaining Olympic spots in the women's singles at the Asian Qualification Tournament in Hong Kong.

[27] Meanwhile, Padasak Tanviriyavechakul received an unused Olympic spot in the men's singles as the next highest-ranked player, after Hong Kong made its decision to decline a berth in the same tournament.

Due to the withdrawal of several tennis players from the Games, twin brothers Sanchai and Sonchat Ratiwatana received a spare ITF Olympic place to compete in the men's doubles.

[30] Thai weightlifters have qualified five men's and four women's quota places for the Rio Olympics based on their combined team standing by points at the 2014 and 2015 IWF World Championships.