The Union Home Minister Rajnath Singh and party leaders Rajiv Pratap Rudy, OP Mathur and JP Nadda were at the meeting where the newly elected 121 BJP legislators chose Fadnavis at the Maharashtra Legislature complex.
Fadnavis, who hails from Nagpur, had earlier pipped his mentor and central minister Nitin Gadkari to bag the coveted post.
Talking to media, BJP Leader Rajiv Pratap Rudy said on Tuesday, "In the MLAs meet Devendra Fadnavis elected as leader of Legislative party unanimously."
Maharashtra Governor C V Rao will administer the oath of office to Fadnavis and his ministers on October 31 at the Wankhede Stadium in Mumbai.
The event will be attended by Prime Minister Narendra Modi, BJP president Amit Shah and around 30,000 guests.
Fadnavis's wife Amruta said, "He worked really hard and now that is paying off, I am very happy. He has been patient, maintained a clean image plus he has a visionary approach."
His mother Sarita Fadnavis said, "He has worked a lot since the time he started."
Soon after the big announcement, celebrations began outside the residence of Fadnavis in Nagpur.
Fadnavis has twice served as the Mayor of Nagpur and became the youngest municipal corporator of the Nagpur Municipal Corporation at the age of 21.
Since 1989, Fadnavis, who is known to be a soft-spoken person and a leader with clean-image, has hold various prominent positions in the BJP.
[Also Read: Profile: Who is Devendra Fadnavis?]
After days of hectic parleys, finally, the BJP that won 122 seats out of 288-seats, in the recently concluded assembly elections, the party decided to form the government.
Earlier, the name of senior BJP leader and Union Minister Nitin Gadkari was doing the rounds for the post of Maharashtra CM, but he refuted all the speculations by confirming that he is not in race for the CM-post and he is happy in Delhi.
On Monday, Shiv Sena softened its stand on BJP and said that they were ready to support any BJP candidate as the chief minister. Sena in its mouthpiece Saamnaa praised Narendra Modi and said that they were ready to support any BJP candidate as the CM.
Maharashtra went to assembly elections on October 15, Thursday, along with Haryana and the results were announced on October 19, Sunday.