Ganesh Vasudev Mavalankar (27 November 1888 – 27 February 1956) popularly known as Dadasaheb, was an Indian politician and independence activist who served as the President (from 1946 to 1947) of the Central Legislative Assembly, then Speaker of the Constituent Assembly of India, and later the first Speaker of the Lok Sabha, the lower house of the Parliament of India.

Mavalankar hailed from a Marathi family, lived and worked in Ahmedabad, former capital of Gujarat.

His family originally belonged to Mavalange in Sangameshwar in the Ratnagiri district of the Bombay Presidency in British India.

After his early education in Rajapur and other places in Bombay Presidency, Mavalankar moved to Ahmedabad in 1902 for higher studies.

Mavalankar was elected to the office of speaker of the Constituent Assembly (Legislative) on 17 November 1947.

With the adoption of the Constitution of India on 26 November 1949, the nomenclature of the Constituent Assembly (Legislative) was changed to the Provisional Parliament.

Mavalankar became the Speaker of the Provisional Parliament on 26 November 1949 and continued to occupy the office till the First Lok Sabha was constituted in 1952.