The 21-year-old recovered from a set down to beat Li Xuerei 17-21, 21-17, 21-18 to clinch the title.
Twice in two years Sindhu settles for bronze; loses to Carolina Marin of Spain in the semi-finals.
Sindhu, seeded 11th, lost her ninth-seeded opponent 17-21 15-21 at the Ballerup Super Arena.
Lee, twice a runner-up at the tournament, brushed aside young Danish hopeful Viktor Axelsen 21-9, 21-7.
19-year-old displays grit and skill to beat World No.2 Shixian Wang 19-21, 21-19, 21-15 in World Championships.
PV Sindhu beats world no.2 Shixian Wang; becomes first Indian to win two medals at World Championships.
Sindhu prevailed over Golovanova 21-12 21-17 in the second round match while Jwala-Ashwini lost 21-16 21-8.
Saina took just 31 minutes to dispose off Perminova 21-11 21-9. Nehwal had earlier got a bye in 1st round.
Long wait ends for Parupalli Kashyap, who claims India’s first men’s badminton singles gold since 1982.
Kashyap became the 1st Indian in 32 years to win men’s singles gold after he defeated Wong 21-14 11-21 21-19.
Kashyap beat England’s Rajiv Ouseph 18-21 21-17 21-18 in an one hour and 23 minute semifinal.
Kashyap said that line calls in semis were simply ridiculous; may be the umpires wanted England to win.
In case Kashyap wins gold, he will become the 1st Indian male badminton player in 32 years to do so.
Saina Nehwal, the defending Commonwealth Champion is not participating in the event.
Prior to the Games, there was talk of India being possible contenders for a Mixed Team-gold.