- Dev Patel as Saroo Brierley
- Sunny Pawar as Young Saroo Brierley
- Rooney Mara as Lucy, Saroo's girlfriend
- David Wenham as John Brierley, Saroo's adoptive father
- Nicole Kidman as Sue Brierley, Saroo's adoptive mother
- Abhishek Bharate as Guddu Khan, Saroo's biological brother
- Divian Ladwa as Mantosh Brierley, Saroo's adoptive brother
- Keshav Jadhav as Young Mantosh
- Priyanka Bose as Kamla Munshi, Saroo's biological mother
- Deepti Naval as Saroj Sood, founder of the Indian Society for Sponsorship and Adoption (ISSA)
- Tannishtha Chatterjee as Noor, a Calcutta woman who briefly takes in young Saroo
- Nawazuddin Siddiqui as Rama, an acquaintance of Noor
- Riddhi Sen as Café Man, who brings young Saroo to the authorities in Calcutta
- Kaushik Sen as Police Official in Calcutta
- Rita Roy as Amita, Saroo's friend at the orphanage
- Menik Gooneratne as Swarmina, who chaperones Saroo, and later Mantosh, on their flights from India to Tasmania
- Pallavi Sharda as Prama, Saroo's college friend
- Sachin Joab as Bharat, Saroo's college friend
- Arka Das as Sami, Saroo's college friend
- Madhukar Narlwade as English Speaking Man
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