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Gagan Thapa is a Nepalese politician, belonging to the Nepali Congress.He is, at present, one of the most popular and influential youth political leaders in Nepal widely followed in various social networking sites. Many youth see him as the next generation Prime minister of Nepal in 10 to 15 years time. Thapa is the central committee member of the Nepali Congress. He was also the former member of the constituent assembly (2008–12)and has been elected for Constituent Assembly (2013-)
In 2008 he became a member of the first constitutional assembly, elected under provision of Proportional Representation from Nepali Congress. He was in the Fundamental Rights and Directive Principle of the Constituent Assembly and the Natural Resources and Means committee of the Legislative Parliament. Prior to the election, he had held important positions within his party as the general secretary of the NC student wing, Nepal Student Union (2002–04), its vice president (2000–02) and central committee member (1998-2000). He was also the president of the Free Student Union of Tri Chandra College, Kathmandu (1998-00). He completed his masters degree in political science from Tribhuwan University, Kathmandu, Nepal. After the 2006 democracy movement he rose as one of the most prominent youth leaders in Nepal. He is a highly praised political leader among Nepalese youths.
In 2013, he ran as Nepali Congress candidate from Kathmandu constituency-4 in the second Constitutional Assembly election held on November 19, 2013, which he won with a huge margin against his opponents. With 22,336 votes, he emerged victorious over his closest contender Nirmal Kuikel of CPN (UML) who managed to collect only 9,028 votes. The third contender from the same constituency with merely 6,462 votes was Nanda Kishor Pun (Pashang) of the UCPN Maoists, who was also the commander in chief of the party's armed-wing People's Liberation Army, Nepal during the insurgency.
He refused to take the salary on extension of duration of constituent assembly beyond the deadline in 2009 and encouraged other to do so. He was the only MP who proposed parties disengage from Nepal bandas. It was him who wrote the bill to stop the burning of tyres during protests. He fought for the right of Nepali children to get citizenship with their mothers’ name. 
He has also written a book named ‘Nepali Congress in Constituent Assembly’.
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- "Entrepreneur Gagan Thapa".
- "Philanthropist Gagan Thapa".