Ramdhari Singh 'Dinkar' (23 September 1908 – 24 April 1974), known by his pen name Dinkar, was an Indian Hindi language poet, essayist, freedom fighter, patriot, and academic.

He emerged as a poet of rebellion as a consequence of his nationalist poetry written in the days before Indian independence. His poetry exuded Veer Rasa (heroic sentiment), and he has been hailed as a Rashtrakavi ('national poet') and Yuga-Chāraṇa (Charan of the Era) on account of his inspiring patriotic compositions.

Dinkar was a regular poet of Hindi Kavi Sammelan and is hailed to be as popular and connected to poetry lovers for Hindi speakers as Pushkin for Russians. One of the notable modern Hindi poets, Dinkar was born in Simaria village of Bengal Presidency, British India, now part of Begusarai district in Bihar state.

The government honored him with the Padma Bhushan Award in 1959 and also nominated him thrice to the Rajya Sabha. His political thought was greatly shaped by both Mahatma Gandhi and Karl Marx. Dinkar gained popularity in the pre-independence period through his nationalist poetry.

Dinkar initially supported the revolutionary movement during the Indian independence struggle, but later became a Gandhian. However, he used to call himself a "Bad Gandhian" because he supported the feelings of indignation and revenge among the youth. In Kurukshetra, he accepted that war is destructive but argued that it is necessary for the protection of freedom.

He was close to prominent nationalists of the time such as Rajendra Prasad, Anugrah Narayan Sinha, Sri Krishna Sinha, Rambriksh Benipuri, and Braj Kishore Prasad. Dinkar was elected three times to the Rajya Sabha, and he was a member of this house from 3 April 1952 to 2 April 1964. He was also the Vice-Chancellor of Bhagalpur University (Bhagalpur, Bihar) in the early 1960s.

During The Emergency, Jayaprakash Narayan attracted a gathering of one lakh (100,000) people at the Ramlila grounds and recited Dinkar's famous poem: Singhasan Khaali Karo Ke Janata Aati Hai ('Vacate the throne, for the people are coming').