The girls in blue successfully chased a 69-run target at the loss of only 3 wickets.
Soumya Tiwari and Gongadi Trisha scored 24 runs each.
Bowling first, India bowled England out for only 68.
All of India's six bowlers returned with at least one wicket.
Titas Sadhu, Archana Devi and Parshavi Chopra were the stars of the show; scalping three wickets apiece.
India vs England: India Conquer The World
HISTORY! India have scripted history here in South Africa, as they became the inaugural champions of the ICC Women's U19 T20 World Cup.
Shafali Verma and her group of bravehearts left England shell-shocked in the final, as they bowled them out for a meek 68, before chasing the total down in 14 overs, losing only three wickets in the process.
The Indians have been dominant right from the very first delivery till the last, as Grace Scrivens' team never really stood a chance. The likes of Titas Sadhu, Parshavi Chopra and Archana Devi starred with the ball, while despite losing the skipper and an in-form Shweta Sehrawat very early in the chase, Soumya Tiwari and Gongadi Trisha did exceptionally well to chase the target down with incredible ease.
This also marks India's first triumph at an ICC event in women's cricket.
India vs England: Curtains to Trisha's Knock
Gongadi Trisha played a match-winning knock today, but she will not see India over the line as Alexa Stonehouse has finally handed her the departure slip.
After 13 overs, India are 66/3.
India vs England: Just 9 Shy
Ellie Anderson was introduced into the attack in the 12th over, and Gongadi Trisha gave her a ceremonious welcome by hitting back-to-back boundaries.
India are now 60/2 after 12 overs.
India vs England: 2 Runs From Stonehouse's Over
Alexa Stonehouse is impressive in her first over, as she concedes only two runs. That, however, is not nearly enough for England, who are now staring at a defeat.
India are 50/2 after 11 overs.