Kovind said she transformed the national capital in her tenure.
"Sad to hear of the passing of Sheila Dikshit, former Chief Minister of Delhi and a senior political figure. Her term in office was a period of momentous transformation for the capital for which she will be remembered. Condolences to her family and associates," the President said in a tweet.
Modi too said she made a noteworthy contribution to Delhi's development.
"Deeply saddened by the demise of Sheila Dikshit. Blessed with a warm and affable personality, she made a noteworthy contribution to Delhi's development. Condolences to her family and supporters," Modi tweeted.