Chaudhary Devi Lal (born Devi Dayal; 25 September 1915 - 6 April 2001) was an Indian politician. He served as 6th Deputy Prime Minister of India from 1989 to 1991 in the management of V. P. Singh and Chandra Shekhar. He is popularly known as Tau (uncle). Devi Lal came out as farmer leader from the state of Haryana. He served as the Chief Minister of Haryana first in 1977-79 and then in 1987-89.