Bachchan, 70, along with actors Shah Rukh Khan, Katrina Kaif and Anushka Sharma inaugurated the 18th Kolkata International Film Festival.
"The contribution made by Bengal to Indian cinema has been absolutely enormous. Eminent directors like Hrishikesh Mukherjee, Bimal Roy, Nitin Bose started their careers from Kolkata before moving to Mumbai," Bachchan, 70, said.
The actor said Bengali cinema produced some of the finest artists in India and continued to influence generations of film-makers, recalling how cinematic giants like P C Barua, Prithviraj Kapoor and K S Saigal received prominence working with the New Theatres studio of Kolkata.
"The thirties and forties were the heydays for films made as much in Mumbai as in Kolkata. The contributions made from this region has been immense," said the megastar.
Bachchan started his speech in Bengali and has also recited a stanza from Rabindranath Tagore's poem 'Banglar Mati Banglar Jol'. He later shifted to English for masses to comprehend.
He said with novels like Sarat Chandra Chattopadhyay's 'Devdas' Bengali literature provided a rich and fertile ground for many screenplays.
"So our love for cinema goes beyond 100 years," he said.
Explaining the importance of mainstream commercial cinema he said it was the voice of the poor and downtrodden.
"In our films justice is done in three hours. But for many of us to get justice in real life takes us three generations," said the actor.
Seated next to West Bengal Chief Minister Mamata Banerjee, Bachchan, fondly called 'Babu Moshai', recalled how he had got his first job in Kolkata decades ago.
"This is also the city where I first dreamt of becoming an actor, Kolkata will always have a special place in my heart," he said.
