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Cast
 Aamir Khan ...  Rancho 
 Kareena Kapoor ...  Pia 
 Sharman Joshi ...  Raju Rastogi 
 Omi Vaidya ...  Chatur Ramalingam aka "Silencer" 
 Madhavan ...  Farhan Qureshi 
 Boman Irani ...  Viru Sahastrabudhhe 
 Mona Singh ...  Mona 
 Rajeev Ravindranathan ...  Lead Ragging Senior 
 Javed Jaffrey ...  Ranchoddas Shamaldas Chanchad (as Jaaved Jaaferi) 
 Ali Fazal ...  Joy 
 Akhil Mishra ...  Librarian Dubey 
 Parikshat Sahni ...  Farhan"s Father (as Pareekshit Sahani) 
 Rahul Kumar ...  Millimetre - MM 
 Meghna Bhatia ...  Raju"s Wife 
 Omi ...  Chatur - pondicherry boy 
 Jayant Kripalani ...  Campus Interview Panel Head (as Jayant Kriplani) 
 Achyut Potdar ...  Machine Class Professor 
 Shoaib Ahmed ...  Chote 
 Farida Dadi ...  Farhan"s Mother 
 Dushyant Wagh ...  Centimetre 
 Malvika Singh ...  Mona"s Baby 
 Arun Bali ...  Shamaldas Chanchad 
 Chandrashekhar ...  Airlines Ground Staff 2 
 Rakesh Sharma ...  Minister at Shyamaldas" Funeral 
 Amardeep Jha ...  Raju"s Mother 
 Atul Tiwari ...  Minister in Auditorium 
 Chaitali Bose ...  Raju"s Sister 
 Pooja Goswami ...  Air Hostess 
 Supriya Shukla ...  Matron in Hospital with Pia 
 Mukund Bhatt ...  Raju"s Father 
 Dinesh Kumar ...  Mona"s Husband 
 Aakash Dabhade ...  ICE Student 2 
 Captain A.S. Duggal ...  Pilot 
 Dharmendra Bhurji ...  Airport Cab Driver 
 Apul Jaisinghani ...  ICE Student 3 
 Annapurna Kaul ...  Airlines Ground Staff 1 
 Dr. Kishor Patil ...  Doctor in Ambulance with Raju 
 Vaidyanathan ...  Professor Vaidyanathan (as Prof. Vaidyanathan) 
 Rajendra Patwardhan ...  Govind 
 Pitobash ...  Junior 1 
 Harvinder Singh ...  Mr. Dhillon 
 Dr. Praful Kulkarni ...  Doctor startled by scooter in hospital 
 Hitesh Tak ...  Ragging Senior 2 
 Nishi Singh ...  Maid at Pia"s House 
 Dileep Desai ...  Priest at Joy"s funeral 
 Sanjay Sood ...  Peanut Vendor at Shimla 
 Michael Joseph ...  Exam Hall Professor 
 Shankar Sachdev ...  Ambulance Driver 
 Shailaja Dhar ...  Lady at Mona"s Wedding 
 Sarvanna ...  College Security Guard 
 R.S. Kodange ...  Doctor at Airport 
 Tanveer Ahmed ...  Professor in Induction Motor Class 
 Saurabh Agnihotri ...  Housekeeping Boy at Pia"s Wedding 
 Kumar Veer Singh ...  Waiter at Mona"s Wedding 
 Sonu ...  Library Clerk 
 Raghunathan ...  Professor in Corridor (as Prof. Raghunathan) 
 Pandit Prayag Raj ...  Panditji at Pia"s Wedding 
 Trilok Sadhwani ...  ICE Student 4 
 Dayal Sharma ...  Caretaker at Shyamaldas" House 
 Sitaram Sharma ...  Manager at Pia"s Wedding 

3 Idiots, which is a movie adaptation of Chetan Bhagatâ??s Five Point Someone, is a lighthearted and entertaining journey of three friends as they try to figure themselves out and share unforgettable experiences.

Two friends, played by Madhavan and Sharman Joshi, are on a hunt for Rancho (Aamir Khan), a maverick, who changed their way of looking at the world. 

They move back in time to their college days, Rancho, his relationship with Pia (Kareena Kapoor), and their tyrannical teacher, played by Boman Irani.

Looking for Rancho, they also have to deal with a bet made in the days gone by, a wedding, and a funeral.