Lalbaugcha Raja is located in Lalbaug. Lalbaugcha Raja is among the most popular Ganesh idol in India. Lalbaugcha Raja (The Emperor of Lalbaug) is name of the popular Ganesh Idol of Lalbaugcha Raja Sarvajanik Ganeshotsav Mandal. The Mandal, formerly known as SARVAJANIK GANESHOTSAV MANDAL, LALBAUG was founded in the year 1934, at its existing place. With the consistent efforts & support of the then local Councillor-Late Shri. Kuwarji Jethabhai Shah, Dr. V. B. Korgaonkar and the local residents, the landlord Rajabai Tayyabali agreed to give a plot for construction of a market.

Lokmanya Tilak introduced the idea of "Sarvajanik Ganeshotsav" for the awakening of people through this medium towards freedom struggle against the British Rule.

History --:
The Mandal, formerly known as 'Sarvajanik Ganeshotsav Mandal, Lalbaug' was founded in the year 1928, because of a vow (Navas) for construction of the present Lalbaug Market at its existing place. The market place at Peru Chawl was shut down in 1932. Hence, the fishermen and vendors who used to sit in the open place vowed to Lord Ganesh for permanent place for their market. With the consistent efforts & support of the then local Councillor-Late Shri. Kuwarji Jethabhai Shah, Dr. V. B. Korgaonkar, Shri.Nakhawa Kokam Mama, Bhausaheb Shinde, Dr.U.A. Rao and the local residents, the landlord Rajabai Tayyabali agreed to give a plot for construction of a market. As fulfillment of their wish, the fisherman and the traders established the Ganesh Idol on 12.09.1934. The idol was dressed in the customary fashion of fisherman. Since that day onwards, this Lord Ganesh has become popular as it fulfills the wishes of devotees. The Mandal was formed in the era when the freedom struggle was at its peak.

Due to the communal riots in 1946, orders were issued to change the route of this Ganesh Immersion Procession. But, the then office-bearers of the Mandal refused to change the route and, after 21 days, the procession was taken by the same route under the supervision of then Volunteers Pandurang alias Babu Sayle, M.S.Pawar and Dattaram Joshi. After independence, the agenda of the Mandal was modified and accordingly the Mandal decided to contribute in uplift of the Country. The Mandal donated its balance amount to the Kasturba Fund, the Mahatma Gandhi Memorial Fund in 1947 and to Bihar Flood Relief Fund in 1959. The social issues were also highlighted in the plots during Ganesh Festival.