She achieved this historic feat by beating Japan's Nozomi Okuhara 21-7, 21-7 in the final.
This was also Sindhu's fifth medal in the World Championships, the joint-most for a female singles player.
Meanwhile, we present the major records broken by her in the tournament.
How did the match pan out?
The match was off to a thrilling start as a 22-stroke opening point was claimed by Okuhara.
However, Sindhu maintained her composure and went up 8-1.
Okuhara succumbed to the pressure as she gave 13 game points to Sindhu.
The second game saw some intensity from Okuhara.
However, Sindhu kept the momentum going as she wrapped up the match 21-7, 21-7.
Sindhu fourth player to win all three World Championships medals
It's an honor to win all three medals in the Championships, as Sindhu joins the elite list. She became the fourth player in the history to win them all. Li Lingwei, Gong Ruina and Zhang Ning are the only other players to have done so.
Sindhu wins joint-most singles medals among women
Sindhu's gold-winning moment was historic as she is now the joint-most successful female tennis player in the World Championships.
She is tied with Zhang Ning of China, who too has won five medals in the tournament.
While this was Sindhu's first gold in the tournament, she had started off with bronze medals in 2013 and 2014, followed by silver medals in 2017 and 2018.
Do you know?
Sindhu fastest to five World Championships medals
Sindhu might soon see herself being called the 'Fast and Furious', as she has become the fastest player across genders to claim five medals at the World Championships, having played just six tournaments to date.
Sindhu wins most matches in World Championships
Apart from winning the joint-most singles medals in the event, Sindhu scripted another record. She has now registered the most number of wins by a female player in the tournament, having won 21 matches to date, since her debut in 2013.