| R. K. Nehru | |
| Office: | Foreign Secretary |
| Termstart: | 1952 |
| Termend: | 1955 |
| Predecessor: | K. P. S. Menon |
| Successor: | Subimal Dutt |
| Office2: | Ambassador of India to China |
| Termstart2: | 1955 |
| Termend2: | 1958 |
| Predecessor2: | Nedyam Raghavan |
| Successor2: | G. Parthasarathy |
| Office3: | Ambassador of India to United Arab Republic |
| Termstart3: | 1958 |
| Termend3: | 1960 |
| Office4: | Secretary-General of the Ministry of External Affairs |
| Termstart4: | 1960 |
| Termend4: | 1963 |
| Predecessor4: | N. R. Pillai |
| Successor4: | Position abolished |
Ratan Kumar Nehru, or R.K. Nehru, (10 October 1902 – 2 April 1981) was an Indian civil servant and diplomat. He served as the Foreign Secretary, 1952–1955, and later as India's ambassador to China and United Arab Republic (Egypt). During 1960–1963, he was appointed the Secretary-General of the Ministry of External Affairs, a period in which India faced an invasion from China. He retired in 1963, after which the position of Secretary-General was abolished, and the Foreign Secretary role became the head of the Ministry.[1] [2]
He was son of Mohanlal Nehru, grandson of Nandlal Nehru.[3]