Ranganathan Madhavan (born 1 June 1970) is an Indian actor, writer, director, and producer who predominantly appears in Tamil and Hindi films. Over the course of his career, he has been a recipient of several accolades.

Madhavan gained recognition in Tamil cinema by starring in Mani Ratnam's romantic drama film Alai Payuthey (2000). He soon developed an image as a romantic hero with notable roles in two of the highest-grossing Tamil films of 2001, Gautham Vasudev Menon's directorial debut Minnale and Madras Talkies' Dumm Dumm Dumm. He achieved further critical and commercial success with films such as Kannathil Muthamittal (2002), Run (2002), Jay Jay (2003) and Aethirree (2004). In the mid-2000s, Madhavan also actively pursued a career in Hindi films, by appearing in supporting roles in three highly successful productions, Rakeysh Omprakash Mehra's Rang De Basanti (2006), Mani Ratnam's biopic Guru (2007) and Rajkumar Hirani's comedy-drama 3 Idiots (2009), which went on to become the highest-grossing Indian film of all time at the time of its release. During this time, Madhavan also simultaneously continued working in Tamil cinema with the films Evano Oruvan (2007) and Yavarum Nalam (2009).

After appearing in further box office hits, Tanu Weds Manu (2011) and Vettai (2012), Madhavan took a break from acting. Returning after a three-year sabbatical in 2015, his comeback films, the romantic comedy-drama Tanu Weds Manu Returns (2015), the bilingual sports drama Irudhi Suttru (2016) and the crime film Vikram Vedha (2017) all won critical and commercial acclaim. His performance as a boorish boxing coach in Irudhi Suttru fetched him Best Actor awards at the Filmfare, IIFA and SIIMA award ceremonies.

In addition to his acting career, Madhavan has worked as a writer on his films, hosted television programs and has been a prominent celebrity endorser for brands and products. He has also worked as a film producer, first making Evano Oruvan with Leukos Films, before setting up Tricolour Films to produce Saala Khadoos (2016). Madhavan is noted for his philanthropic activities and promotes various causes such as environment, health, and education. He is particularly vocal about the protection of animals and was awarded PETA's Person of the Year recognition in 2011. In 2021, he was conferred the honorary degree of Doctor of Letters by D. Y. Patil Education Society, Kolhapur, for his contribution to arts and cinema.

Early life
Ranganathan Madhavan was born on 1 June 1970 in Jamshedpur, Bihar (now in Jharkhand), India, to a Tamil Brahmin family. His father Ranganathan Iyengar was a management executive in Tata Steel and his mother, Saroja was a manager in the Bank of India. His younger sister, Devika, is a software engineer. He had a Tamil-speaking upbringing in Jharkhand. Madhavan did his schooling from D.B.M.S. English School Jamshedpur.

In 1988, Madhavan gained a scholarship to represent India as a cultural ambassador from Rajaram College, Kolhapur and spent a year in Stettler, Alberta, Canada, as part of an exchange programme with Rotary International. He returned to Kolhapur and completed his education, graduating with a BSc in Electronics. During his college years, Madhavan became actively involved in extra-curricular military training and at 22, he was recognised as amongst the leading NCC cadets in Maharashtra, which allowed him to make a trip with seven others as NCC cadets to England. As a result of this opportunity, he received training with the British Army, the Royal Navy and the Royal Air Force, which he had, at a point, considered joining. However he missed the age cut-off by six months and was subsequently unable to join the programme. After he lost out on the place, he began teaching courses on public speaking and personality development skills in Kolhapur and the satisfaction he gained through teaching, prompted him to pursue a post-graduation in public speaking at Kishinchand Chellaram College in Mumbai. During the period, he also won the Indian Championship for Public Speaking and subsequently represented India at the Young Businessmen Conference in Tokyo, Japan in 1992. During his stint in Mumbai, he opted to create a portfolio and submit it to a modelling agency in order to gain more income to set up an office.