AK Hangal has acted in around 225 Hindi films in a career spanning from 1966 to 2005.
Hangal made his Bollywood debut at the age of 50 with Basu Bhattacharya's Teesri Kasam in 1967.
His other notable films are Namak Haraam (1973), Shaukeen (1981), Sholay (1975), Aaina (1977), Avtaar (1983), Arjun (1985), Aandhi (1975), Tapasya (1976), Kora Kagaz (1974), ...
AK Hangal in a still from Guddi.
The 98-year-old actor recently made an appearance in television show Madhubala.
The Government of India awarded him the prestigious Padma Bhushan for his contribution to Hindi Cinema in 2006.
His son Vijay Hangal is a retired Bollywood photographer and cameraman.
AK Hangal was hospitalised following a major hip fracture on August 16. He was taken off ventilator after he became restless.
Two years back also, he was in news over his poor financial condition and deteriorating health after which political parties and others had offered help.
AK Hangal with posters during the peace march protest against Gujrat riots.
Filmmaker Mahesh Bhatt posted, "Adieu Hangal Saab! What an innings!!!"
"A K Hangal no more, an era comes to an end. Theatre and films were enriched by him," singer Abhijeet Bhattacharya said.
"Veteran Actor A K Hangal no more... just passed away. Had great moments with him at IPTA...may his soul rest in peace," filmmaker Ashok Pandit said.
Ashmit Patel tweeted, "A moment of 'sannata' for the grand ol' man of Indian cinema. #RIP AK Hangal Sahab."
"A K Hangal, RIP. respect," said Ranvir Shorey.
Director Anubhav Sinha wrote, "Is this a year of deaths? So many people just moving on to the other side. RIP Mr Hangal."
"The real grand old man of Hindi cinema Mr AK HANGAL. Thank you for some iconic moments you gave us," posted actor Gulshan Devaiah.
Jitendra Raghuvanshi, National General Secretary of IPTA said that in the demise of A K Hangal, who was the National President of the theatre association, said the country had lost a "great artist and patriot".
"Hangal had given all his time and resources to theatre, films and social service, doing nothing for himself. Immediately after the death of his daughter in law in 1994, he went straight to the studios to complete his assignments," said Raghuvanshi.