Thai third seed beat Line Christophersen of Denmark in a nail-biter that went to a deciding game.
Thailand's Busanan Ongbamrungphan has clinched the women's singles title at the 2021 Orléans Masters BWF Tour Super 100 event.
The third seed defeated Denmark's Line Christophersen in a tough three-game final that lasted an hour and a minute.
Christophersen took the first game, but Ongbamrungphan, a quarter-finalist at the recent All England Open, fought hard to stay in touch.
The Thai took the second game 21-15, and although her Danish opponent pushed her all the way in the decider, Ongbamrungphan took it 21-19.
Another Dane, Mads Christophersen, suffered defeat in the men's singles final.
France's Toma Popov Junior defeated Mads 23-21, 21-13 in a straightforward match after a really close first game.
Earlier, English duo Ben Lane and Sean Vendy have clinched the men's doubles crown.
Lane and Vendy, who recently pushed world number two pair Mohammad Ahsan and Hendra Setiawan to three tough games at the All England Open, triumphed in Orléans in three games.
Their Indian opponents Krishna Prasad and Vishnu Vardhan took a close first game, 21-19, but the English pair hit back.
Lane and Vendy won the second game 21-14, before being pushed all the way in the decider. They eventually held on for a 21-19 win in the third.
Thailand's Jongkolphan Kititharakul and Rawinda Prajongjai, meanwhile, defeated Bulgaria's Gabriela and Stefani Stoeva in the women's doubles final in a clash between the top and second seeds.
The Thais were triumphant in straight games, 21-16, 21-16.
There was an all-Danish affair in the mixed doubles final as Mathias Christiansen and Alexandra Bøje took on Niclas Nøhr and Amalie Magelund.
It was seventh seeds Christiansen and Bøje who were victorious in 36 minutes, as they ran out straight-games 21-13, 21-17 winners.