Kejriwal, who is also AAP's national convener, asked the winners to work hard and serve Aam Aadmi in the best possible manner.
Out of the 13 wards, AAP won five seats in the bypolls which are Matiala, Tekhand, Nanakpura, Vikas Nagar and Ballimaran wards.
After AAP won five seats, Kejriwal thanked the people for helping the party emerge as the largest party in MCD bypolls.
MCD, which was trifurcated in 2012, has been a BJP-ruled body for nearly a decade. Out of the 13 wards, seven were previously held by BJP, one by RLD and five by Independents.