In 2011, Raghav Chadha joined the uprising against corruption in India, also known as the India Against Corruption movement led by social activist Anna Hazare. He met Arvind Kejriwal during the movement. Raghav Chadha has been a part of the Aam Aadmi Party (AAP) since its inception. Mr. Kejriwal encouraged him in drafting the Delhi Lokpal Bill in 2012, which was also his first political task. He established himself as the AAP's TV face and also became the youngest national spokesperson of the AAP and one of the youngest across parties.
When AAP won the 2015 Delhi Legislative Assembly election with a majority, Chadha at the age of 26 was appointed AAP's national treasurer. In April 2018, the then Union Minister of Home Affairs, Rajnath Singh, terminated his appointment as an advisor to Sisodia along with 9 other advisors.
In 2019, he contested from the South Delhi Parliamentary Constituency in the 2019 Lok Sabha elections. He lost in the elections to the BJP candidate, Ramesh Bidhuri and came second. Chadha got the maximum vote share among all the AAP contestants in the election. Since the 1980s, South Delhi has been a BJP stronghold and represented by stalwarts like Madan Lal Khurana and Sushma Swaraj.
In 2020, as a leader of AAP, he was appointed AAP Punjab co-in-charge for the Punjab Legislative Assembly election. He is recognised as the co-architect of AAP's landslide victory in Punjab when the AAP won 92 out of 117 assembly seats
