Harihar Singh or Bihari Ji Singh (1925-1994) was an Indian politician and a former Chief Minister of Bihar.

He succeeded Bhola Paswan Shashtri, as the Chief Minister of Bihar in 1969.

[1] Harihar Singh's tenure as Chief Minister lasted just a few months – he led an INC-led coalition government and all six members of Soshit Dal, a constituent party of the coalition, defected to the Opposition during a budget session of the Bihar Assembly.

[2] Harihar Singh was born in a small village of Chaugain in Buxar, Bihar in British India to an Rajput[3] family.

He was also a Bhojpuri poet and has written many patriotic Bhojpuri poems full of nationalist ideas.